Snowball Earth by 6CW

Snowball Earths

100

What happened during a Snowball Earth?

The Earth was encased in ice.

300

What did the ice covering the Earth do to the sunlight?

Reflected it back into space.

500

There were 3 Snowball Earth events between these times.

(How many YA - How many YA)

2.4 - 2.2 BYA

Greenhouse Gases

100

When the greenhouse gases reduced, the Earth got ____________.

Colder

300

This gas was the one which reduced the number of greenhouse gases in the atmosphere.

Oxygen

500

What did the reduction in greenhouse gases lead to in this time?

Snowball Earth events

Vocabulary

100

What is the meaning of 'coupled'?

When two things are paired together.

300

What does reduction mean?

To make something smaller in value, or to lessen something.

500

Mass Glaciation means...

the rapid formation of glaciers over a very large area.

Global Climate

100

During this time period, the climate on Earth got...

colder.

300

Did any organisms survive the cold climate?

Yes

500

As the greenhouse gases increased, the planet got...

warmer.

Volcanoes

100

Volcanic _____ escaped into the atmosphere.

gases

300

T/F:

Carbon Dioxide is produced by volcanoes.

True

500

The oxygen levels _______ before the Snowball Earth events.

rose