Ch. 6 Test review

Question 1

Geologists use the geologic time scale to show Earth's history because the time span is so big.

Accepted Answer

True

Question 2

The time it takes for half of the radioactive atoms to decay.

Accepted Answer

half life

Question 3

The age of a rock compared to the ages of other rocks.

Accepted Answer

relative age

Question 4

Lava that hardens on the surface and forms igneous rocks.

Accepted Answer

extrusion

Question 5

A record of the events & the evolution of life forms as shown in the fossil record.

Accepted Answer

geologic time scale

Question 6

Which period of the Cenozoic Era is the shortest?

Accepted Answer

Quaternary

Question 7

The number of years that have passed since a rock formed.

Accepted Answer

absolute age

Question 8

Which Era is the Cambrian period part of ?

Accepted Answer

Paleozoic

Question 9

Which fossil appears to be the best index fossil?

Accepted Answer

C

Question 10

According to the law of superposition, which layer is the youngest?

Accepted Answer

A

Question 11

Elements that can break down over time and release particles and energy.

Accepted Answer

radioactive decay

Question 12

Mass of igneous rock formed when magma pushes into bodies of rock underground & cools & hardens

Accepted Answer

intrusion

Question 13

According to the law of superposition, which layer is older than layer D?

Accepted Answer

E

Question 14

This is useful because it tells the relative age of the rock layers in which it occurs.

Accepted Answer

index fossil

Question 15

Which of the following is not a type of fossil found in rock?

Accepted Answer

preserved remains

Question 16

Which of the following is the longest Era?

Accepted Answer

Paleozoic

Question 17

Scientists believe Earth began as:

Accepted Answer

rock, ice, and dust

Question 18

A ball of dust, gas, and ice that orbits the sun.

Accepted Answer

comet

Question 19

The 3 long units of time geologists divide time between Precambrian and the present into.

Accepted Answer

Era

Question 20

What pulled the mass of "Earth" together?

Accepted Answer

gravity

Question 21

An organism that no longer exists and never will again live on Earth.

Accepted Answer

extinct

Question 22

According to the law of superposition, which layer is the oldest?

Accepted Answer

F

Question 23

The change in living things over time.

Accepted Answer

evolution

Question 24

Gaps in the geologic record and bending can change the position in which rock layers appear.

Accepted Answer

False

Question 25

The preserved remains or traces of living things.

Accepted Answer

fossil

Question 26

The fossil record provides:

Accepted Answer

both of the options

Question 27

Which of the following are substances other than rock that can preserve a fossil?

Accepted Answer

ice, amber, and tar

Question 28

Most fossils form when living things die and are buried by sediment that slowly hardens to rock

Accepted Answer

True

Question 29

Scientist who studies fossils.

Accepted Answer

paleontologist

Question 30

In undisturbed layers of rock, the oldest rocks are at the bottom & the youngest at the top =

Accepted Answer

The law of superposition

Question 31

Which statement regarding the relative ages of rocks and events is accurate?

Accepted Answer

Faults are younger than the rock layers they cut through

Question 32

Involves atoms of one element breaking down to form atoms of another element,

Accepted Answer

radioactive decay

Question 33

Which of the following is the shortest Era?

Accepted Answer

Cenozoic

Ch. 6 Test review

Questions 33

Ch. 6 Test review

Questions 33