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Flashcards in Ch4 Deck (23):
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Preserved remains or traces of living things

Fossils

1

A Hollow area in sediment in the shape of an organism or part of an organisms

Mold

2

A solid copy of the shape of an organism

Cast

3

Fossils in which minerals replace all of an organism or a part such as a dinosaur bone

Petrified fossils

4

Extremely thin coating of carbon on rock

Carbon film

5

Provides evidence of the activities of ancient organisms

Trace fossils

6

Scientists who study fossils are called

Paleontologist

7

The change in living things over time

Evolution

8

No longer exists and will never again live on earth

Extinct

9

A rock is it's age compared to the ages of other rocks

Relative age

10

A rock is the number of years that have passed since the rock formed

Absolute age

11

Determine the relative age of sedimentary rock layers

Law of superstition

12

Lava that hardens on the surface and forms igneous rock

Extrusive

13

Magma cools and hardens into a mass of igneous rock

Intrusive

14

A break in earths crust

Fault

15

A fossil must be widely distributed and represent an organism that excited for a geologically short period of time

Index fossil

16

A gap in the geologic record

In conformity

17

These elements release particles and energy in this process

Radioactive decay

18

A radioactive elements is the time it takes for half of the radioactive atoms to decay

Half life

19

A record of the geologic events and the evolution of life forms as shown in the fossil record

Geologic time scale

20

Time and present are split into three long units of time called

Eras

21

Eras subdivides into units of geologic time called

Periods

22

The key principles that guide scientists when the make inferences about earths past is the principle of

Uniformitarianism