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Earth Science 11 Q2mod1 Weathering Politchay
Science 10 (SCI10)
Ateneo de Manila University
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Preview text
WEATHERING
Module 1a- Earth Science 11
Second Quarter
JUVY DALE F. POLITCHAY
Developer
Department of Education • Schools Division of Benguet
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Republic of the Philippines DEPARTMENT OF EDUCATION Cordillera Administrative Region Schools Division of Benguet Wangal, La Trinidad, Benguet
Published by: Learning Resource Management and Development System
COPYRIGHT NOTICE
2020
Section 9 Presidential Decree No. 49 provides:
“No copyrights shall subsist in any work of the Government of the Philippines. However, prior approval of the government agency of office wherein the work is created shall be necessary for exploitation of such work for profit.”
This material has been developed for the implementation of K-12 Curriculum through the Curriculum Implementation Division (CID) – Learning Resource Management and Development System (LRMDS). It can be reproduced for educational purposes and the source must be acknowledged. Derivatives of the work including creating an edited version, an enhancement or a supplementary work are permitted provided all original work is acknowledged and the copyright is attributed. No work may be derived from this material for commercial purposes and profit.
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ACKNOWLEDGEMENT
With fathomless appreciation and love, the developer would like to express her gratitude to the people who have shared their knowledge, time, and effort in the development of this module. To the Almighty God, Who has been so good and gracious through all these years, praises, honor and thanksgiving be unto His name. Utmost gratitude is due to Benguet Division LRMDS staffs for their detailed and constructive criticism, selfless guidance and encouragement. To Mrs. Bivian B. Cuh-ing , Principal I, Loo National High School, for the motivation and encouragement to make this material, her sincere thanks. To her family, friends and relatives for the continuous support, guidance, and prayers whom she has been grateful with. The developer has been grateful for those who helped in the materialization of this learning material. The fulfillment of this module would not be possible without these people.
DIVISION LRMDS STAFF:
####### MELVIN L. ALFREDO ANTIONETTE D. SACYANG
Librarian II Project Development Officer II
####### SONIA D. DUPAGAN
####### EPS-LRMDS
####### CONSULTANTS:
MERLYN CONCHITA O. de GUZMAN EPS- Science
RIZALYN A. GUZNIAN, EdD Chief, Curriculum Implementation Division
SAMUEL T. EGSAEN JR., EdD Public Schools District Supervisor OIC-Office of the Assistant Schools Division Superintendent
BENILDA M. DAYTACA, EdD, CESO VI Assistant Schools Division Superintendent OIC-Office of the Schools Division Superintendent
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TABLE OF CONTENTS
Page
Copyright Notice ................................................................................ ii
Preface ............................................................................................ iii
Acknowledgement .............................................................................. iv
Table of Contents ............................................................................... v
Title Page ......................................................................................... 1
What I Need to Know........................................................................... 2
What I Know ................................................................................. 3
Lesson Proper................................................................................... 4
What’s In ......................................................................................... 4
What’s New ..................................................................................... 5
What’s in It...................................................................................... 6
What’s More ..................................................................................... 9
What I Have Learned............................................................................. 11
What I Can Do .................................................................................... 12
Assessment ........................................................................................ 13
Additional Activities ............................................................................... 14
Answer Key ....................................................................................... 17
Reference ......................................................................................... 18
Feedback Note ................................................................................... 19
Pre-Assessment
Good day! Before we proceed, please answer the following items below. Your score will determine if you need to continue with the next module or not. Kindly encircle your answer. Let’s get started.
- It is the action of the weather conditions in altering the color, texture, composition or form of exposed objects. A. Erosion B. Abrasion C. Dissolution D. Weathering
- It is the thing or object that mostly undergo weathering. A. Soil B C D. Rocks
- It is a type of weathering in which a rock is physically broken into smaller pieces due to any force without any alteration of its compositions. A. Mechanical B. Chemical C. Anthropological D. Surgical
- All are processes of chemical weathering, except _____________________. A. Abrasion B. Dissolution C. Oxidation D, Hydrolysis
- It is the wearing away of rocks by constants collisions of loose particles leading to weathering. A. Frost Wedging B. Abrasion C. Biological Activity D. Hydrolysis
- It is the dissociation of molecules into ions. A. Oxidation B. Reaction C. Dissolution D. Hydrolysis
- Chemical weathering: Hydrolysis; Mechanical Weathering: ________________. A. Burning B. Oxidation C. Salt Crystal Growth D. Dissolution
- Frost wedging is under chemical weathering. A. True B. False C. Maybe
- Dropping of menthol candy in coke is an example of what type of weathering A. Mechanical B. Physical C. Chemical
- It is the biological agents of mechanical weathering. A. Wind B. Water C. Tropical Cyclone Ambo D. Eubacteria
- It is the length of exposure to agents leading to weathering. A. Climate B. Rock Type C. Topography D. Time
- Steep slope causes more weathering than gentle one, this describe what factor affecting the rate of weathering? A. Rock Type B. Climate C. Rock Structure D. Topography
- Presence or absence of joints and faults causes weathering, this describe what factor affecting the rate of weathering? A. Rock Type B. Climate C. Rock Structure D. Topography
- Physical weathering occurs faster in gentle slope than steep slope. A. True B. False C. Maybe D. Sometimes
- Weathering happens fastest in ________________________. A. cold and dry areas C. shorter time of exposure to agents B. solid mass of rock D. high temperature and high rainfall
What I Know
LESSON PROPER
Welcome! I hope the past activity had increase your drive to continue learning using this module. Before we proceed, let us try to recall past concepts related to our topic.
Check Up 1:
Study the diagram on rock cycle below then answer the questions after it.
Question Rocks?
- What are the 3 types of rocks which undergoes transformations?
- Which causes these transformations:
- Metamorphic rocks to igneous rocks:_______________ _______________
- Igneous rocks to metamorphic rocks: __________________________
- Sedimentary rocks to metamorphic rocks: ______________________
- If you had observed the dotted arrows in the diagram, it illustrates how sediments were formed from the different types of rocks. Kindly write the process which causes this transformation. ?1.______________ ?2.______________ ?3.______________
- What do you think happens to the sediments if left in the environment for how many years?______________________________________________________________
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What’s In
Rock Note! Were you able to recall the correct answers? Good job. You are now ready to proceed to the next step. Please flip this page to be able to see it.
Welcome to the lessons discussion. I know that you are still coping and very willing to learn more. Let’s start...
WEATHERING is the longest word in your rock twist activity. Weathering is the breakdown of rocks at the Earth’s surface, by the action of rainwater, extremes of temperature, and biological activity (Geologic 2012). It does not involve the removal or transfer of rock material from one area to the other (This is to differentiate weathering from erosion).
2 MAIN TYPES OF WEATHERING
1. MECHANICAL WEATHERING
When a rock falls from a certain height it breaks into smaller pieces without changing it physical compositions. Due to the non-alteration of the physical attribute of the rock mechanical weathering is also called as physical weathering. The following are the processes that leads to mechanical decomposition of rocks:
Process Description Frost Wedging The picture shows a rock which is a product of frost wedging. When liquids such as water and hailstones”dadalo” gets inside a joint or any opening in a rock or stone, alternate freezing and thawing happens causing the rock to crack. Can you imagine what will happen to a rock if this happens often? Salt Crystal Growth The hole on the rock can cause it to fall apart. This is due to force exerted by salt crystal pushing the rocks apart. Salt crystals may be formed from the evaporation of water leaving ions such as sodium and chlorine as salt precipitate. Abrasion It is the wearing away of rocks due to continuous collision of loose particles.
The picture starts to break due to its constant collision with natural agents such as wind, water and other rocks.
What’s in it
Politchay, 2020 2020
Politchay, 2020
Politchay, 2020 2020
Process Description Biological Activity Breaking of rocks due to plants, animal and even humans. The physical weathering part as shown from the picture is cause by the cultivation of plant roots loosening the rock. Remember that biological activity is under mechanical weathering if it causes a rock or any object to break into smaller pieces only, it does not change the chemical composition of the rock. 2. CHEMICAL WEATHERING What happens to a nail after its been exposed to the environment for how many years? It rusted right? This is because the iron is converted to iron oxide due to its exposure to moisture or oxygen. The reddish coloration of some rocks are same with the nail. The examples given above illustrates chemical weathering which is the disintegration of rocks caused by chemical reactions. Below are the major processes of chemical weathering. Process Description Dissolution It is the removal of some minerals of rocks because of acidic solutions found in the environment leaving holes in rocks which can slowly enlarge and widen after frequent exposure. Corals and some stones are submerged to water, it reacts with acids in the water and dissolved. The presence of small holes in the picture shows the product of dissolution. Oxidation
Breakdown of rock by reacting with oxygen. It often looks like a rusty-like rock. This is because of the iron oxide being formed from the reaction of iron rich rocks to H 2 O and O 2.
Hydrolysis Hydro: Water Lysis: Split Decomposition of rocks as its minerals react with water especially acidic ones that creates various chemical reactions.
Biological Activity Breaking of rocks due to plants, animals and even humans. Biological activity can also cause chemical weathering by altering the rock’s chemical composition. Example, microorganism produces organic acids which could dissolve minerals that causes the rock to be more susceptible to weathering.
Politchay, 2020 2020
Politchay, 2020 2020
Politchay, 2020 2020
####### ASSESSMENT 1
List 4 other terminologies related to weathering
####### ACTIVITY 2
- Word Hunt. Locate the given word/s in the grid, running in horizontal, vertical or diagonal directions.
Mechanical Chemical Oxidation Climate Time Rock Structure Rock Type Topography
Weathering
####### ASSESSMENT 2
a. Distinguish the two types of weathering by completing the concept map below:
####### ACTIVITY 3
a. Identify the factor that is being describe below:
- Chemical weathering is slow in cold and dry areas._____________________
- Longer exposure to agents of weathering means higher rate of weathering.______________________
- Physical weathering occurs more quickly on a steep slope than on a gentle one.______________________
- Weathering rates roughly follow the inverse of crystallization. ____________
- The presence of cracks where agents of weathering can enter enhances weathering. _______________
____________________
____________________
####### TYPES OF
####### WEATHERING
____________________
____________________
Generalization
At this point, you should be able to reflect on what you have learned in the lesson. Discuss the following briefly. 1. Define weathering in your own words. __________________________________________________________________ __________________________________________________________________ __________________________________________________________________ __________________________________________________________________
The 2 types of weather are Mechanical and Chemical Weathering. The difference of the 2 are: __________________________________________________________
The factors that affect the rate of weathering are: ___________________________
What I Have Learned
Hi! You are about to finish the race. Hang in there.
Let’s try to connect the lesson you have learned to real life situation by answering the following questions:
- What are the positive effects of weathering? Please cite an example you can
observe in your community to support your answer.
- What are the negative effects of weathering? Please cite an example you can
observe in your community to support your answer.
What I Can Do
Rock Note! Good job! You were able to reach this point. You’re now ready to be challenged for the last time. What are you waiting for.. flip the page.
Instructions: . Draw or capture a photo of any object undergoing weathering in your backyard, or any area nearest your home. I’m sure you could be able to take a great picture without difficulty since examples of weathering are just around you.
Additional Activities
For additional information about weathering, you may visit the following video sites if you have an internet access.
youtube/watch?v=BxmAJMjJ5Nk
youtube/watch?v=ZM4M2J3GdSQ
youtube/watch?v=opeibsGAwT
youtube/watch?v=qCZZIoPio
ANSWER KEY
Earth Science 11 Q2mod1 Weathering Politchay
Course: Science 10 (SCI10)
University: Ateneo de Manila University
- Discover more from:
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