Which substance is a mixture of organic matter & weathered rock?

• Schist

• Soil

• Limestone

• Granite

What is located beneath soil layers?

• Bedrock

• Humus

• Lava

• Tundra

Which layer of soil has the most humus?

• A horizon

• Bedrock

• Subsoil

• Regolith

Which best describes forest soil?

• More clay in the humus layer than in deeper layers

• More rock fragments in the humus layer than in deeper layers

• More sand-sized particles in the humus layer than in deeper layers

• More organic matter in the humus layer than in deeper layers

Which layer in a soil profile would be most affected by weathering & erosion

• C horizon

• B horizon

• R horizon

• A horizon

The 4 agents of erosion are________

• air, fire, water, & metamorphism

• wind, water, gravity, & ice

• topographic, sedimentary, igneous, & deposition

• igneous, sedimentary, metamorphic, & gravity

The 2 types of weathering are _________

• alpha & beta

• physical & conventional

• conduction & convection

• chemical & physical

What most likely would cause a sinkhole to form?

• Collapse of the roof of a limestone cave

• Abrupt movement of two tectonic plates

• Thinning of topsoil due to forest clearing

• Impact of meteorite striking the surface of Earth

The Valley & Ridge province of VA has karst geologic features. Which best describes karst features?

• Physical weathering of igneous rocks

• Chemical weathering of metamorphic rocks

• Physical weathering of foliated gneiss rock layers

• Chemical weathering of limestone rock layers

The main reason for one crustal plate sinking below another crustal plate at a subduction zone is __________

• gravitational force differences between the crustal plates

• density differences between the crustal plates

• magnetic anomalies between the crustal plates

• frictional force differences between the crustal plates