Unit 7 ATT Review

People increase erosion in forested areas by

• tilling the soil

• cutting down trees

• polluting the air

• planting invasive species

It took thousands of years to form this canyon. What MOST LIKELY caused the formation of the canyon?

• a rushing river

• an earthquake

• a volcano

• a tectonic shift

High levels of pollution will MOST LIKELY

• increase the rate of chemical weathering.

• decrease the rate of physical weathering

• decrease the rate of chemical weathering

• increase the rate of physical weathering

Concerned about the erosion of local coastal marshes, your class decides to take action. What is the best thing to do?

• Dredge the marsh to clean it up.

• Plant coastal vegetation to help restore the ariea

• Restrict over-fishing in the area

• Build walkways throughout the marsh.

Reese put gravel, sand, and clay in a bottle. She added some water, shook the bottle, and left it for an hour. What did she see after an hour?

• Clay settled at the bottom and sand settled at the top.

• Gravel settled at the bottom and clay settled at the top.

• Clay settled at the bottom and gravel settled at the top.

• Sand settled at the bottom and clay settled at the top.

Consider how sedimentary rocks are formed; from sediments! What two processes are responsible for (a) making the particles that become sediments and (b) moving the particles that become sediments?

• sedimentation and deposition

• gravity and erosion

• deposition and weathering

• weathering and erosion

What caused the rocks to fall in this landslide?

• The constant movement of the Earth split these rocks apart

• The rocks were heavier than the soil supporting them.

• Gravity was constantly pulling these rocks down towards the Earth.

• The force of friction caused the rocks to break apart.

If you were to observe a handful of soil, what materials would you MOST LIKELY find?

• small pieces of recycled glass and tiny pebbles

• large minerals and fossilized remains of organisms

• weathered rock and decomposed organic remains

• small living plants and hardened lava from a volcano