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100

The third planet from the sun

What is Earth? 

100

(blank)formed around 4.6 billion years ago.

 what is the solar system?

200

the force pushing down on us

what is gravity?

200

There are eight planets in the ..... 

what is the Solar System? 

300

a property of air

what is a liquid?

300

....... are smaller and made mostly of rock and metal.

what is The inner planets ?

400

 this is a dwarf planet

 what is pluto?

400

(blank) are lift, weight, thrust and drag. 

What Are the Four Forces of Flight?

500

the star all the planets in the solar system orbit around

what is the sun?