Which statement is true about soil?

1. TEK 4.10AIdentify and observe effects of events that require time for changes to be noticeable including growth, erosion, dissolving, weathering, and flow.

2. Which statement is true about soil?

3. Soil can evaporate into air. • Soil can change into water. • Soil contains only small pieces of rock. • Soil contains small pieces of plants, animals and rocks.

4. The correct answer is D. Soil is composed of small pieces of plants, animals and rock. These pieces have broken down into smaller parts from larger objects due to weathering, dissolving and erosion.All of these processes take time.

5. These answers are incorrect because... A. Soil is composed of solids that can’t evaporate into the air. B. The solids that make up soil can’t magically change into water. C. Small pieces of rock are only one part of the soil mixture

6. What will probably happen to the soil in the picture if heavy rains should occur?

7. The soil will turn to rock. • The soil will wash away with the run off. • The rocks will stop the water from flowing. • Grass will immediately replace the dirt.

8. The correct answer is B. The soil will get carried away with the water that runs down the hill. This is an example of erosion.

9. These answers are incorrect because: • It takes millions of years for soil to turn into rock. • C. The rocks will not stop the flow of water they too will eventually be moved by running water. • D. Grass seeds would first have to be planted and it would take time for the grass to grow.

10. Baby Adult As this animal grows into an adult what change would be most noticeable?

11. The eyesight of the animal. • The number of legs the animal uses to walk. • The coloring of the fur. • The place where the animal lives.

12. The correct answer is C. The best answer is C because as the fawn grows, its fur will lose the spots and become a solid brown color. The fawn uses the spots as camouflage when it’s too little to run from its enemies.

13. The other answers are incorrect because… • The animal’s eyesight will not change drastically. • The number of legs the animal walks on won’t change. • D. The animal will continue to live in the habitat where it was born unless forced to move.

14. What do the pictures above show about the solubility of sugar and pepper?

15. Sugar is soluble in water but pepper is not. • Pepper is soluble in water but sugar is not. • Pepper and sugar have the same solubility. • If stirred the pepper would have the same solubility of sugar.

16. The correct answer is A. The sugar has completely dissolved in the water and the molecules in the sugar are now surrounded by the water molecules.

17. These answers are incorrect because... B. The pepper has not dissolved in the water and is still visible. C. If the pepper had the same solubility as the sugar then it would also not be visible. D. The physical properties of the pepper prevent it from completely dissolving in the water no matter how much it is stirred.

18. What is the correct sequence of the development of this river delta?

19. W, X, Y, Z • Z, W, Y, X • X, Z, Y, W • Y, Z, X, W

20. The correct answer is C. The delta is formed gradually as sediment is deposited by the flowing water at the mouth of the river. As the soil builds up the water must find new ways to reach the lake by cutting through the delta in different paths.

21. The other answers are incorrect because… A, B and D don’t show the delta getting gradually larger. They show the development of the delta out of sequence.