Science test
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| What is the chemical and physical processes that change objects on Earth's surface over time? | Weathering
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| What helps to break up rocks into smaller pieces over thousands of years? | Weathering
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| What happens during mechanical weathering? | Physical processes break up rocks into smaller pieces
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| Does mechanical weathering change the make up of the rock? | No
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| What happens to the total surface area when mechanical weathering breaks up a large rock into smaller pieces? | The total surface area of the rock increases
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| What holds more water and nutrients sandy or clay soil? | Clay soil holds more water and nutrients
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| Why does clay soil hold more water and nutrients? | Clay soil consists of smaller particles that have more surface area
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| What happens during ice wedging? | Water enters into cracks in rocks and freezes
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| What happens to water during ice wedging? | The water expands when it freezes and makes the cracks larger
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| What is it called when rocks grind away by friction or impact? | Abrasion
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| What else can cause mechanical weathering? | Plants growing in a crack or animals burrowing through loose rock
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| What happens during chemical weathering? | The materials that make up rocks are changed into new material
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| What is an important agent of chemical weathering and why? | Water and because most substances dissolve in water
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| What is a more powerful agent of chemical weathering-water or acid? | Acid
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| The measure of acidity is called what? | Ph
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| What do you call a ph less than 7? | Neutral
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| Why does rain weather rock? | Because rain is slightly acidic
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| What is acid rain? | Rain that contains pollutants that make its pH less than 5
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| What happens during oxidation? | Oxygen combines with other elements or molecules
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| During oxidation where does most of the oxygen come from? | The air
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| What is the product of oxidation? | Oxide/rust
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| Why are oxides useful? | They form ores which people use to obtain metals
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| Which part of a rock oxidizes the most because it has more contact with oxygen in the air? | The outer layer
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| What do mechanical and chemical weathering depend on? | Humidity and temperature
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| When does mechanical weathering occur the most? | In areas where the temperature changes a lot-expanding and contracting
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| Where does chemical weathering occur? | In areas where the climate is warm and wet
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| Where does weathering occur the fastest? | In regions near the equator
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| What affects how fast weathering occurs? | The type of rock
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| What determines how quickly the rock weathers? | The most easily weathered mineral
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Created by:
jacksterner