APES Unit 4

What type of event will occur at this boundary?

• Earthquake

• Volcano Eruption

• Tornado

• Mountain Building

A divergent boundary occurs when plates ....

• Pull apart

• Come together

• Slide past each other

• subducting

Which horizon is made up of partially weathered rocks?

• Horizon A
• Horizon B
• Horizon C
• Horizon D or R

_______ is the type of soil used most often with plants. It is a mixture of clay, sand, and silt.

• loam
• humus
• mud
• dirt

Soil sample that is 60% clay, 30% silt, and 10% sand has which texture? 

• clay
• clay loam
• sandy loam
• silt 

Which is the correct order of soil horizons starting at the surface?

• A, B, E,C, O
• O, A, B, C, E
• O, E, A, B, C
• O, A, E, B, C

The rate at which water flows through the soil is called soil percolation or ______.

• Groundwater

• Permeability

• Soil Pores

• Porosity

Which soil component has the least capacity for holding water?

• silt
• clay
• sand
• humus

You dig a small hole in the soil and the next day it rains. The hole fills with water, but does not empty even after several days of dry weather. What is the soil mostly made of?

• clay
• sand
• humus
• silt

Observe this diagram of a plate boundary. One statement BEST describes what is happening. It is that

• the oceanic crust is melting.

• the denser ceanic crust is subducting under the less dense oceanic crust

• volcanic islands are forming.

• the tectonic plates are moving away from each other.