Section 5 Vetebrate History In Rocks

Question 1

What is a fossil ?

Answer 1

The hardened remains of other evidence of a living thing that existed a long time ago

Question 2

Where can a fossil be imprinted

Answer 2

On a rock such as an animals footprint

Question 3

What are other fossils?

Answer 3

Remains of bone, shells skeletons or other parts of living things

Question 4

What type of rock are fossils mostly found in?

Answer 4

Sedimentary rock

Question 5

What makes up sedimentary rock?

Answer 5

Hardened layers of sediments ( sediments contain particles of clay, sand, med or silt)

Question 6

How do sediments build up into layers?

Answer 6

Wind blows into sand dunes or when muddy water stands still . Over a very very long time sediments can build up and harden into rock. When a plant or animal dies and is trapped in the sediments, it is sometimes preserved as a fossil

Question 7

How do paleontologists infer how animals have changed over time?

Answer 7

By studying fossils

Question 8

Fossils in which layers of rock are are younger?

Answer 8

Fossils in the higher level of rock are younger then the fossils in the lower levels

Question 9

What other method do scientists use to determine the age of a fossil?

Answer 9

They use radioactive chemical elements. The radioactive elements decay over time . The more there is a decayed form of the element, the older the fossil is

Question 10

Vertebrates are a subgroup of?

Answer 10

Chordates

Question 11

Layers of clay, sand, and mud harden and become?

Answer 11

Sedimentary rock