Weathering and Soils

Weathering and Soils

Week 4, Lesson 3

Multiple Choice

In a tropical rainforest, which experiences a lot of rainfall and is very hot, which type of weathering might you expect most?

• Chemical

• Physical

Poll

Which type of mechanical weathering do you think is most dominant in Los Angeles? (just the City, so not including beaches).

• Frost wedging

• Biological

• Sheeting

• Salt crystal growth

Multiple Choice

In a good soil, half of it is made up of pore spaces filled with _____ and ____

• humus; rock

• regolith; humus

• air; water

• humus; water

Multiple Select

The following helps increase the rate of soil formation [select all that may apply]:

• parent material made up of rock fragments

• cold temperatures

• the presence of organic matter

• steep-sloped soils

• All the above

Multiple Choice

Soil fertility describes the soil's:

• Ability to create more soil particles

• Ability to sustain vegetation

• Ability to absorb more water

• Ability to resist erosion

Multiple Choice

Dark-colored soils indicate high presence of mineral material

• True

• False

Multiple Choice

Nutrients leach out of the ____ horizon and accumulate in the _____ horizon.

• A; E

• B; C

• E; B

• A; C

Poll

If a soil doesn't have an O horizon and a large E horizon, do you think that it would be able to grow lots of vegetation?

• Yes

• No

Multiple Choice

What are some of the results of deforestation?

• Loss of soil nutrients

• Increased erosion

• Soil "baking"

• All the above

Poll

Once an area is cleared from logging, it can eventually be re-forested again.

• Yes

• No

Multiple Select

Vegetation helps prevent events like the Dustbowl because:

• Roots hold soil in place

• It can act as a barrier against the wind, like trees.

• It acts as a cover against splashing rainfall and runoff

• All of the above