7th Science: Unit 3 'Our Earth'

Select the correct sequence of the four eons of the Earth's history.

• Hadean eon, Archean eon, Proterozoic eon, Phanerozoic eon.

• Phanerozoic eon, Hadean eon, Proterozoic eon, Archean eon

• Hadean eon, Archean eon, Phanerozoic eon, Proterozoic eon.

• Proterozoic eon, Phanerozoic, Hadean eon, Archean eon

Select ALL the weather conditions.

• 
• 
• 
• 
• 

Select the correct eon:

* The whole Earth was hot and there were many volcanos.

• Hadean eon

• Phanerozoic eon

• Archean eon

• Proterozoic eon

Select the correct eon:

* The continents we know today were formed

• Hadean eon

• Phanerozoic eon

• Archean eon

• Proterozoic eon

Select the correct eon:

* Oxygen built up in the Earth's atmosphere

• Hadean eon

• Phanerozoic eon

• Archean eon

• Proterozoic eon

Select the correct eon:

* 542 million years ago, the first uni-cellular and micro-organisms appeared

• Hadean eon

• Phanerozoic eon

• Archean eon

• Proterozoic eon

Dinosaurs were the dominant animal group in the ...................... era.

• Cenozoic

• Paleozoic

• Mesozoic

Microorganisms _________ into more complex organisms.

• evolved

• adapted

• competition

Life started in the Phanerozoic eon, around 542 millions years ago.

• TRUE

• FALSE

The first animals (living things) appeared on the oceans and seas.

• TRUE

• FALSE