Chapter 8 Study Guide

Front 1

Earth's oceans formed by.......

Back 1

Rain filled low-lying areas

Front 2

The Cambrian Explosion was partly the result of ...... and .......

Back 2

Rising sea levels and warming temperatures

Front 3

....... led to the formation of Earth's earliest atmosphere

Back 3

Volcanic eruption

Front 4

If geologic time is condensed into one year when did humans appear on Earth

Back 4

December 31st

Front 5

Asteroid impacts can cause global cooling and......

Back 5

Mass extinctions

Front 6

One cause of the Great oxygenation event was........ carried on by unicellular ocean organisms

Back 6

Photosynthesis

Front 7

..... caused early continents to form on Earth

Back 7

Plate movements

Front 8

What two things during the Hadean made Earth very hot

Back 8

Asteroid impacts in radioactive decay

Front 9

The ..... was partly the result of the release of oxygen from water molecules split by energy from the Sun

Back 9

The great oxygenation event

Front 10

During the .... eon, thermal energy coming from radioactive decay help produce seas of molten rock

Back 10

Hadean

Front 11

An asteroid impact during the Phanerozoic eon resulted in ..... and ........

Back 11

Global cooling and mass extinction

Front 12

The increase in biodiversity during the Phanerozoic eon is referred to as the.....

Back 12

Cambrian explosion

Front 13

What Eon did the photocontinents form

Back 13

Archean

Front 14

Earth's earliest atmosphere formed from volcanic gases during the early part of the.....eon

Back 14

Hadean

Front 15

What gave Earth its spherical shape

Back 15

Pull of gravity on Earth's hot rock

Front 16

..... helps create new oceanic crust

Back 16

Tectonic plate movement

Front 17

Know two types of evidence that were used to develop the geological time scale

Back 17

Based on Superstition old rock on bottom fossils....... division accurate when big changes happen

Front 18

Know which rock is older Permian or Devonian and justify your answer on how this occurred

Back 18

Could be reversed if there was movement such as folding

Front 19

Know that these things help support the Earth's early forms of life

Increased oxygen in the atmosphere, warm, shallow seas and cooler temperatures

Back 19

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