5 Written Questions

1. weathers rock by dissolving in rainwater to form carbonic acid which dissolves in rock; esp. limestone and marble
2. soil that is made up of equal parts of clay, sand and silt- best for growing plants
3. process that breaks down rock and other substances at Earth's surface
4. value of soil is reduced when----
5. for in cool, wet climates, range from thick and fertile to thin with little humus

5 Matching Questions

1. B horizon
2. water
3. C horizon
4. ice wedging
5. chemical weathering

1. a wedges of ice in rocks widen and deepen cracks
2. b forms as bedrock weathers and rock breaks up into soil particles; little organic material or life
3. c forms as rainwater washes clay and minerals from the A horizon
4. d process that breaks down rock through chemical changes
5. e weathers rock by dissolving it; most important cause of chem. weathering

5 Multiple Choice Questions

1. refers to the average weather conditions in an area
   1. climate
   2. water
   3. loam
   4. soil
2. is the solid layer of rock beneath the soil in which One of the main ingredients of soil comes from
   1. loam
   2. topsoil
   3. bedrock
   4. soil
3. Soil is a mixture of---
   1. living organisms (lichens)
   2. rock particles, minerals, decayed organic material, water, and air
   3. climate, plants and soil composition
   4. mix the soil and make spaces in it for air and water and make humus
4. The most important factors that determine the rate at which weathering occurs are
   1. climate
   2. the type of rock and climate
   3. loss of topsoil
   4. loss of fertility
5. soil is clssified based on----
   1. climate, plants and soil composition
   2. soil horizon
   3. soil conservation
   4. conservation plowing

5 True/False Questions

1. humus → is a dark-colored substance that forms as plant and animal remains decay and helps create spaces in soil for the air and water that plants must have.

   True        False

2. oxidation → grinding away of rock by rock particles carried by water, ice, wind or gravity

   True        False

3. living organisms (lichens) → soil and plants cover is disturbed as little as possible, leaving dead weeds and remains of previous crops to fertilize soil and prevent erosion

   True        False

4. oxygen → weathers rock by dissolving it; most important cause of chem. weathering

   True        False

5. topsoil → is the loose, weathered material on Earth's surface in which plants can grow

   True        False