Rock layers

Question 1

A river has cut a canyon and you can see many layers in the walls. What do the layers show?

• A. paint added by people
• B. the river's colour
• C. one year of weather
• D. a record of how the area changed over a very long time

Question 2

At the bottom of a lake, mud builds up about 5 cm every 100 years. A layer of mud is 40 cm thick. About how many years did it take to form?

Answer 

Question 3

Why might an old layer be found ABOVE a younger one?

• A. Earth movements folded or flipped the layers.
• B. Old layers float.
• C. Someone carried it there.
• D. The bottom layer is always youngest.

Question 4

At the bottom of a lake, mud builds up about 2 cm every 100 years. A layer of mud is 18 cm thick. About how many years did it take to form?

Answer 

Question 5

A fossil is found in a layer deep below another layer. Which fossil is older?

• A. the one in the higher layer
• B. you can never tell
• C. they are the same age
• D. the one in the deeper layer

Question 6

At the bottom of a lake, mud builds up about 5 cm every 100 years. A layer of mud is 45 cm thick. About how many years did it take to form?

Answer 

Question 7

A rock layer contains rounded pebbles and fossil river snails. What was the environment when it formed?

• A. a glacier
• B. the deep ocean floor
• C. a desert with no water
• D. a river

Question 8

At the bottom of a lake, mud builds up about 2 cm every 100 years. A layer of mud is 16 cm thick. About how many years did it take to form?

Answer 

Question 9

A fossil is found in a layer deep below another layer. Which fossil is older?

• A. they are the same age
• B. you can never tell
• C. the one in the deeper layer
• D. the one in the higher layer

Question 10

At the bottom of a lake, mud builds up about 2 cm every 100 years. A layer of mud is 10 cm thick. About how many years did it take to form?

Answer