Weathering

What is the weathering process in which rocks are broken down into smaller pieces (sediments) and do not change the rock composition?

• chemical weathering

• mechanical weathering

• acid rain

• oxidation

The surfaces of old concrete statues are often covered with small holes or pits. Which of these MOST LIKELY causes these holes or pits?

• The concrete becomes pitted as water freezes in small cracks in the statue.

• The concrete is chemically weathered by acid rain.

• The concrete is chipped away by sand particles blown by strong winds

• Long exposure to sunlight causes the pits to form.

The diagrams shows a rock with water trapped in the cracks during the day and at night.

Which statement best explains why this process results in weathering?

• frozen water acts as a solute

• the mass of water increases when it freezes

• water expands when it freezes

• frozen water dissolves most types of rock

What happens to a rock when it weathers?

• It settles out of water that is carrying it.
• It creates a valley.
• It forms a delta.
• It breaks into small pieces.

Tree roots cause

• physical weathering.
• chemical weathering.
• both chemical and physical weathering.
• neither chemical or physical weathering.

Any time a reaction occurs

• physical weathering results.
• chemical weathering results.
• neither chemical or physical weathering results.
• both chemical or physical weathering occurs.

Different soils may have different sizes of earth materials.

• True
• False

An example of chemical weathering is -

• Ice wedging

• Oxidation

• Animals burrowing

• Crashing waves

Over millions of years, weak carbonic acid can dissolve limestone to form -

• Cracks in rocks

• Caves and caverns

• Mountains and cliffs

Mechanical Weathering is the same as Physical Weathering

• True

• False