Weathering and Erosion

What is physical/mechanical weathering?

• The breakdown of a rock's shape or size

• Chemical changes that breakdown a rock's mineral structure

• Rocks are worn away from acid in plant roots.

• Rocks broken down by machinery.

What is chemical weathering?

• The breakdown of a rock's shape or size

• Chemical changes that breakdown a rock's mineral structure

• Rocks are worn away from acid in plant roots.

• Rocks broken down by machinery.

The diagrams  shows a natural process that weathers rock.
 Which statement best explains why this process results in weathering?

• frozen water acts as a solute
• water expands when it freezes
• the mass of water increases when it freezes
• frozen water dissolves most types of rock

Which rock layer is MOST resistant to weathering?

• A

• B

• C

• D

What is the relationship between particle size, surface area and the rate of weathering?

• As particle size decreases, surface area decreases, the rate of weathering decreases

• As particle size decreases, surface area increases, the rate of weathering increases

• As particle size increases, surface area increases, the rate of weathering increases

• There is no relationship

Which climate conditions produce the greatest amount of chemical weathering?

• cool and dry

• warm and dry

• warm and moist

• cool and moist

Mass Movements: Landslides, mudslides, rockfall, and creep are caused by.....

• wind

• gravity

• ice

• water

Which particles will be transported by a stream moving at a velocity of 1 cm/s?

• A) Some pebbles, sand, silt, and clay

• B) Some sand and silt

• C) Some sand, silt, and clay

• D) Sand only

If the velocity of a stream decreases from 20 cm/s to

0.1 cm/s, which sediments will STILL REMAIN IN TRANSPORT?

• Some Pebbles only

• Some Silt and Clay only

• Some Pebbles, Sand, Silt, and Clay only

• Some Pebbles Sand and Silt only

Which rock layer is MOST resistant to weathering ?

• 1

• 2

• 3

• 4