Miscellaneous
Interaction between spheres
100

How do rainbows happen

Sun reflecting off water

100

How does the biosphere and atmosphere interact

Any flying animal

200

How did the dinosaurs die

Big meteor

200

How does the hydrosphere and the lithosphere interact

Water in the soil

300

What is the ancestor to the trex

Chickens

300

How does the hydrosphere and atmosphere interact

Rain or water in the clouds

400

is the earth completely round

The earth is not completely round

400

How does the lithosphere and the atmosphere interact

Dirt/dust in the air

500

What is the earths largest living structure 

Coral reefs

500

How does the biosphere and the lithosphere interact

Worms,moles

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