Soils Video 1 and Video 2 Questions

True or False: According to the speaker, what is the difference between soil and dirt is that dirt is displaced soil.

• Ture

• False

What is the definition of soil according to the speaker?

• The mixture of rocks, sand, and water that can support life

• The mixture of organic matter, water, and air that can support life

• The mixture of minerals, organic matter, and water that can support life

• The mixture of minerals, water, and air that can support life

What is the key word in determining whether Mars has soil according to the speaker?

• Temperature

• Life

• Water

• Minerals

What is the main contributor to soil formation by dislodging small pieces of rock?

• Climate

• Water

• Temperature

• Biology

What is the main factor that controls the rate of soil formation?

• Topography

• Time

• Parent material

• Climate

Which factor affects soil formation by causing rocks to expand and contract?

• Topography

• Climate

• Water

• Temperature

Which factor affects soil formation by making soils thinner on mountains and deeper in valleys?

• Topography

• Climate

• Time

• Parent material

What is the role of biology in soil formation according to the speaker?

• Providing nutrients and water to plants

• Supporting plant growth and providing nutrients

• Breaking rocks and soils into smaller pieces

• Contributing to the diversity of life in soils

What is the average time it takes for rock to fully form into soil according to the speaker?

• Thousands or millions of years

• Hundreds of years

• Tens of years

• A few years

What is the composition of a handful of soil?

• 45% mineral, 25% Water, 25% Air, 5% Organic Matter

• 60% solid material, 20% water, 20% air

• 40% solid material, 30% water, 30% air

• 45% solid material, 30% water, 25% air