Earthquakes, Natural Hazards, Soil REVIEW

Which of these particles in soil has the most water retention?

• clay
• gravel
• silt
• sand

Soil is made of

• weathered rocks and minerals
• dead plants and animals
• air and water
• all of the above

A plant that needs well drained soil would grow best in soil made of mostly of:

• clay
• humus
• silt
• sand

Scientists observe soil to determine what plants will grow in an area. What do scientists mean when they talk about the texture of soil?

• the weight of the soil

• the temperature of the soil

• the feel of the soil

• the color of the soil

Many plants cannot grow in sandy soil. Why is this true?

• Sandy soil does not hold enough water.
• Oxygen cannot pass through sandy soil.
• Roots cannot easily push through clay soil.
• Sandy soil has too many nutrients.

11.What is humus? What color is soil with lots of humus?

• The organic material in soil; dark brown to black

• Sand in the soil; dark brown to black

• The organic material in soil; light tan

• Silt in the soil; light tan

10.List the 3 types of soil from SMALLEST to LARGEST particle size:

• Sand, Silt, Clay

• Silt, Clay, Sand

• Clay, Sand, Silt

• Clay, Silt, Sand

6.What is the difference between weathering and erosion? Give an example of each.

• Weathering breaks down the rock (example: wind blowing sand). Erosion moves the broken pieces (example: a river wearing away pieces of rock).

• Weathering breaks down the rock (example: a river wearing away pieces of rock). Erosion moves the broken pieces (example: wind blowing sand).

• Erosion breaks down the rock (example: wind blowing sand). Weathering moves the broken pieces (example: a river wearing away pieces of rock).

• Erosion breaks down the rock (example: a river wearing away pieces of rock). Weathering moves the broken pieces (example: wind blowing sand).

Soil is formed 

• very quickly
• after a few weeks
• over thousands of years
• by magic

What is the main component of soil?

• Humus

• Water

• Air

• Rock particles