Thurs. Ch. 9 Lesson 2 pg. 254-257
- 1. True or false. Soil is made from weathered rock, air, water, and the remains of living things.
A) True
B) False
- 2. Why is humus important for soil?
A) It contains rocks
B) It isn't important
C) It contains nutrients
- 3. What is the top layer of soil called?
A) topsoil
B) subsoil
C) parent rock
- 4. What layer of soil is located beneath the topsoil?
A) tree roots
B) parent rock
C) subsoil
- 5. Look at the circle graph on pg. 257. What percentage of loam is made of silt?
A) 9%
B) 18%
C) 25%
- 6. Look at the circle graph on pg. 257. What percentage of loam is made of water?
A) 18%
B) 25%
C) 9%
- 7. Look at the circle graph on pg. 257. Which two components of loam make up 50% of the contents?
A) water and sand
B) clay and sand
C) air and water
- 8. Look at the picture of the sand on pg. 256. Light colored sand contains very little __________ ___________.
A) organic dirt
B) organic grains
C) organic matter
- 9. True or false. Earthworms help soil formation by mixing the soil and breaking down organic matter.
A) True
B) False
- 10. Humus is ________ colored. Humus contains nutrients for the soil.
A) light
B) dark
- 11. True or false. Soil and dirt are basically the same.
A) False
B) True
- 12. Make a list of three factors that affect soil formation.
- 13. Use the vocabulary word ROCK CYCLE in a sentence.
- 14. How does soil in the desert differ from soil in the tropical rain forest?
- 15. Why is loam ideal for growing plants?
A) It holds water, drains well, and often contains organic matter.
B) It isn't ideal for growing plants, parent rock is better.
C) It is dry and light colored.
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