APES Unit 4 Review

Front

What is the texture of a soil sample that is 60% clay, 30% silt, and 10% sand?

Back

Clay

Front

What occurs at a divergent boundary?

Back

Plates pull apart.

Front

What is the process called when the ocean floor sinks beneath a deep-ocean trench and back into the mantle?

Back

Subduction.

Front

What causes the movement of tectonic plates?

Back

Convection currents in the Asthenosphere.

Front

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

Back

O, A, E, B, C.

Front

Define soil horizon.

Back

A layer of soil, generally parallel to the soil surface, with physical and chemical properties that differ from the layers above and beneath.

Front

What is the role of clay in soil texture?

Back

Clay particles are very small and help retain moisture and nutrients.

Front

What is the significance of the O horizon in soil?

Back

The O horizon is the organic layer, rich in decomposed plant material.

Front

What is the difference between silt and sand in soil composition?

Back

Silt particles are smaller than sand but larger than clay, affecting water retention and drainage.

Front

What geological feature is formed at a convergent boundary?

Back

Mountains, trenches, or volcanic arcs.