SOCIAL STUDIES

1.Why is Earth known as the "blue planet"? 

• because its covered 70% by water

• because the blue skies and the sea

• because is the third planet from the solar system

• becuase the seas are blues

2.How far is Earth from the Sun?

• 146.7 millions of km away

• 146.5 millions of km away

• 146.9 millions of km away

• 146.4 millions of km away

3.What caused Earth to gradually grow in size?

The earth gradually grown in size because ______ was add it to it

When the temperature dropped below 100 c degrees, what falls from the Sky?

• rocks

• acid rain

• fire

• rain

when the first living bacteria emerged?

• 1.8 billion years ago

• 2.8 billion years ago

• 3.8 billion years ago

• 6.8 billion years ago

what are the two geological eras names in the passage?

• Precambrian and Phanerozoic

• Paleozoic and Mesozoic

• Cenozoic and Mesozoic

• Precambrian and Paleozoic

5.What is believed to be the first living being to emerge on Earth?

• ribosomes

• chromosome

• virus

• bacteria

7.What kinds of animals appeared during the Paleozoic Era? 

• mammals and birds

• natural gas, oil deposit, and coal

• invertebrate, fish and amphibians

• mammals and predominant species