Chapter 6 Test

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Which of the following is NOT an example of mechanical weathering?

• freezing and thawing
• plant growth
• animals burrowing
• acid rain

________ is the removal of rock particles by wind, water, ice, or gravity.

• erosion
• weathering
• acid rain
• chemical weathering

________ dissolves in rain water and forms carbonic acid which easily weathers rock such as marble and limestone.

• oxygen
• carbon dioxide
• limestone
• water

Weathering occurs faster in which climate?

• dry
• dry and windy
• wet
• cold

_________ is a loose mixture of rock particles, minerals, decayed organic material, air, and water in which plants can grow.

• humus
• subsoil
• C horizon
• soil

________ is soil that is made up of equal parts clay, sand, and silt, and is best for growing most types of plants.

• humus
• loam
• topsoil
• subsoil

How does contour plowing help prevent erosion?

• farmers leave dead weeds and stalks from previous crops to retain moisture
• farmers plant different crops in fields each year
• farmers plow fields along curves of the slope of the land to help slow runoff
• farmers lay down hay over planted seeds to prevent soil erosion

A(n) ________ is a deep valley a river flows through near its source. As it flows, it cuts the valley deeper.

• meander
• v-shaped valley
• oxbow lake
• canyon

Which of the following is NOT caused by rivers?

• beach
• waterfalls
• meanders
• delta