Unit Six(fossils)

Question 1

Definition: Petrified

Answer 1

A rock like substance formed when water penetrated dead organic matter

Question 2

What is silica?

Answer 2

A very hard rock

Question 3

Original remains are…

Answer 3

An animal being preserved in ice, tar, resin, etc.

Question 4

What is a trace fossil?

Answer 4

Footprints, wormholes, etc. that have been fossilized

Question 5

What is a mould?

Answer 5

Hard parts of organism dissolve and leave a cavity in the rock

Question 6

What is a cast?

Answer 6

A fossil in which sediments or minerals fill a mould and harden into rock

Question 7

What is the principle of superposition?

Answer 7

The older layers of sedimentary rock are on the bottom and the newer layers on the top

Question 8

Definition: Strata

Answer 8

Layers of sedimentary rock

Question 9

What is relative dating?

Answer 9

A strategy used to figure out the age according to their position in the strata

Question 10

What is a index fossil?

Answer 10

A type of fossil that can be used to determine the age of material it is found in.

Question 11

What is half life?

Answer 11

The amount of a radioactive substance reduced by one half

Question 12

What is radiometric dating?

Answer 12

Figuring out the age of a rock by measuring the amounts of radioactive particles in a rock

Question 13

How many years ago was the Precambrian period?

Answer 13

4500milliom

Question 14

How long ago was the paleozoic period?

Answer 14

590million

Question 15

How long ago was the Mesozoic period?

Answer 15

248million

Question 16

How long ago was the cenzoic period?

Answer 16

65

Question 17

The northern portion of Pangea was called …?

Answer 17

Laurasia

Question 18

The southern portion of Pangea was called…?

Answer 18

Gondwanaland

Question 19

Definition:Petroleum

Answer 19

A type of oil found in rock formations on the earths crust

Question 20

Definition: Bitumen

Answer 20

Solid form of petroleum