Weathering and erosion

What is weathering?

• A process that breaks down rocks into smaller pieces

• A shift in weather patterns

• The process by which mountains are formed

• The process by which the seasons change

What can you infer about ice from the information presented in the movie?

• It usually causes chemical weathering

• It expands as it freezes

• It barely causes weathering at all

• It does not exert pressure on rocks

How is mechanical weathering different from chemical weathering?

• Chemical weathering happens over a much shorter time frame than mechanical weathering

• Chemical weathering occurs in the tropics; mechanical weathering occurs in temperate climates

• Chemical weathering occurs in mountains; mechanical weathering occurs on flat surfaces

• Chemical weathering changes the chemical composition of materials; mechanical weathering does not

What might cause mechanical weathering?

• Acid rain

• Violent earthquakes

• Growing plants and expanding ice

• Volcanic eruptions

What impact does weathering have on soil formation?

• Chemical weathering adds helpful chemicals to the soil

• Rocks are broken down into smaller pieces, and finally into sediment

• Mechanical weathering adds ice to the soil, which turns into water

• Volcanic eruptions contribute metamorphic rocks to the soil

What types of rocks are formed by weathering?

• Metamorphic rocks

• Igneous rocks

• Sedimentary rocks

• Volcanic rocks

Carbonic acid is a mixture of:

• Water and carbon dioxide

• Calcite and quartz

• Oxygen and hydrogen

• Water and limestone

What type of changes does erosion cause?

• Physical changes

• Chemical changes

• Electrical changes

• Magnetic changes

Which of the following is NOT a type of chemical weathering?

• water
• carbon dioxide
• ice wedging
• living organisms secreting acid to break down rocks

What is erosion?

• The process by which
  water, ice, wind or gravity
  moves fragments of rock
  and soil.
• The process by which
  water, ice, wind or gravity
  deposit rock sediments
  and soil in a new place.
• The breaking down of
  Earth’s crust into smaller
  and smaller pieces.