A rift valley is evidence of which type of plate boundary?

• convergent
• divergent
• transform
• uniform

Which process explains why less dense, hot magma rises while more dense, cool magma sinks?

• conduction
• radiation
• diffusion
• convection

How can changing the vegetation in an area affect the environment?

• Adding plants will increase sedimentation.
• Adding plants will increase erosion.
• Removing plants will increase erosion.
• Removing plants will increase deposition.

How do glaciers help to creat new soil?

• they carry living plant material to the ocean
• they scrape small particles off of large rocks
• they melt rocks along its path
• they freeze small paricles of soil to form rocks

How do plants slow soil erosion by heavy rains?

• plants absorb water from the soil
• plant roots hold soil particles together
• plant leaves release water from the soil into the air
• plants decrease moisture evaporation from the soil

How can you INCREASE the amount of sand and gravel eroded by flowing water?

• increase the water temperature
• add larger gravel sediments
• increase the slope of the stream bed
• reduce the slope of the stream bed

How are atoms of Carbon isotopes different from one another?

• atomic number
• number of electrons
• number of protons
• number of neutrons

The Law of Superposition states that In undisturbed layers of sedimentary rock, the ____ rock layers are younger than the ___ rock layers.

• upper, lower
• lower, upper
• more dense, less dense
• less dense, more dense

Which landform is an example of deposited sediments?

• canyon
• sea arch
• delta
• valley

What can you conclude about the age of fossils found in sedimentary rock layers?

• they formed at the same time
• the rock is older than the fossils
• the fosils are older than the rock
• nothing can be concluded