1855581
Description
Flashcards by irenepapers, updated more than 1 year ago
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Created by irenepapers
almost 10 years ago
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| Question | Answer |
| Weathering | process that breaks rocks down into smaller and smaller pieces |
| What are the 2 types of weathering? | Mechanical and Chemical |
| What is the similarity with chemical and mechanical weathering? | Both break rocks into pieces |
| Mechanical Weathering | breaks rocks into smaller pieces without changing the chemical make-up of the rock |
| What are the types of Mechanical Weathering? | Temperature Changes, Abrasion, Ice Wedging (Frost Action), Root Action, and Animal Activity |
| The rate of mechanical weathering depends on what? | A mineral’s hardness |
| Temperature Changes | The heat during the day causes objects to expand, then at night they contract. This causes peeling & flaking of rock’s outer layers. |
| Abrasion | when rock particles rub against one another & other rocks due to streams, wind, waves, gravity, and glaciers |
| Ice Wedging (Frost Action) | caused by freezing and melting of water in cracks. |
| Root Action | pressure from root growth breaking into cracks |
| Animal Activity | animals dig holes in the ground which allows air and water in resulting |
| Chemical Weathering | process that breaks down rocks by changing the chemical makeup of the rock |
| Chemical weathering is faster with? | - High temperature - More Moisture |
| What are the Types of Chemical Weathering? | Plant Acids, Oxidation, Natural Acids, and Hydrolosis |
| Plant Acids | tannic acid in plants dissolves the minerals in the rocks causing them to break down |
| Oxidation | oxygen reacts with the minerals in the rocks and cause them to break down |
| Natural Acids | carbonic acids form in the air and reacts with the rocks to break them down |
| Hydrolosis | water reacts with minerals in rocks |
| What are the factors affecting weathering rates? | Rock Make-Up, Surface Area, Climate, Topography & Elevation, and Organic Activity |
| Frost Action is most likely to occur when? | The type of climate is cold and moist |
| Why are caves not formed in just any type of rock? | Hydrolysis can only absorb minerals in certain types of rocks |
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