Soil and Weathering

What is soil?

• rocks, clay, and silt
• gravel, pebbles, and sand
• clay, sand, and humus
• humus and dead plant material

What happens to a rock when it weathers?

• It settles out of a river.
• It forms soil.
• It freezes.
• It breaks into small pieces.

Which is NOT an example of physical weathering?

• abrasion
• acid rain
• water freezing
• tree roots growing

If a rock is weathered from a reaction occurring, this is...

• physical weathering
• chemical weathering

Chemical weathering is different than physical weathering because...

• it breaks the rock into small pieces.
• it uses water.
• it is faster.
• it produces new materials.

Dead and decomposing plant and animal material is called...

• soil
• matter
• silt
• humus

This rock reacts with acid and produces crystals.

• sandstone
• limestone
• basalt
• granite

Abrasion is...

• rocks dissolving.
• chemical reactions.
• rock materials being combined.
• rubbing and banging together.

Caves would most likely form in this type of rock.

• conglomerate
• sandstone
• limestone
• basalt

These rock structures look like skinny towers sticking up out of the ground.

• mountains
• boulders
• deltas
• hoodoos