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Weathering 1
6th Grade Science: Unit 7 - Weathering
| Question | Answer |
|---|---|
| What is weathering? | The breakdown of rock material by physical processes |
| What are the two kinds of weathering? | (1) Physical Weathering (2) Chemical Weathering |
| What is physical weathering? | When rocks are broken down into small pieces |
| What are the six agents of physical weathering? | (1) Temperature (2) Pressure (3) Plant/ Animals (4) Water (5) Wind (6) Gravity |
| What causes rocks to expand and contract? | Temperature Change |
| Explain what ice wedging (frost wedging) is. | Ice wedging causes cracks in rocks to expand as water seeps in and freezes |
| What is exfoliation? | Outer layers of rocks slowly peel away due to pressure |
| What do animals do to expose more rock to weathering? | Dig barrows |
| What is abrasion? | Breaking down and Weathering away of rock material |
| What are the 3 agents of abrasion? | (1) Tumbled down water (2) Wind (3) gravity |
| How does water weather rocks? | It makes it smooth |
| How does wind weather rocks? | It blows on it |
| How do landslides weather rocks? | It makes the impact tore it apart |
| Describe how a plant can split a rock or sidewalk. | First, they start as a tiny seed, then it grows splitting the thing it is in apart |
| What does chemical weathering change in rocks? | Changes the composition and appearance |
| How does oxygen cause chemical weathering? | Reacts to oxygen |
| What color is the soil of rock when it has undergone a chemical reaction? | Redish orange |
| What color of soil do we have a lot of in the southeast? | Red |
| What causes acid precipitation? | Stronger acids fall to Earth |
| What can acids in groundwater cause? | Causes chemical weathering |
| What living organisms produce weak acids that weather rocks? | Leches |
| Define: Chemical Weathering | the breakdown of rocks and minerals through chemical reactions, leading to changes in their composition (these reactions can involve water, oxygen, carbon dioxide, and other substances, altering the internal structure of minerals and often producing new minerals or solubles that can be transported away) |
| Define: Physical Weathering | Physical weathering, also known as mechanical weathering, is the breakdown of rocks and minerals into smaller pieces without changing their chemical composition. This process primarily involves the physical disruption of rock due to factors like temperature changes, frost action, root pressure, or abrasion. |
| Define: Oxidation | A chemical reaction that takes place when a substance comes into contact with oxygen or another oxidizing substance |
| Define: Acid Precipitation | any form of precipitation (rain, snow, or fog) that has a pH lower than 5.6; The acidity of rain enhances chemical weathering processes, meaning it speeds up the breakdown of rocks and minerals |
| What three things does the rate of weathering depend on? | (1) Climate (2) Elevation (3) Makeup |
| What is differential weathering? | Different rocks weather at different rates |
| Give an example of differential weathering and describe it. | Granite and Limestone, the Limestone started to weather but Granite didn’t weather |
| Where does weathering take place? | Outer surface of rocks |
| What weathers faster larger objects or smaller objects? Why? | The smaller objects will weather faster because they have less volume |
| What is climate? | Climate is the average weather condition in an area over a long period of time |
| What type of climate weathers objects the fastest? | Warm and wet |
| Which area of a mountain weathers faster … the top or bottom? Why? | Top due to exposure |
| What other factor effects weathering? Explain. | Gravity, Steeper slope weathers faster |
Created by:
Engle Family
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