How many main spheres work together to make Earth a lovely place?

• two
• three
• four
• five

Hydro comes from the Greek word for _____

• blue
• oceans
• water
• wet

All of the water on Earth is in the _____

• atmosphere
• hydrosphere
• biosphere
• geosphere

Which sphere contains all of the gases on the planet?

• atmosphere
• hydrosphere
• biosphere
• geosphere

Atmos comes from the Greek word for _____

• gas
• clouds
• air
• wind

Which sphere reaches everywhere and covers the entire planet like a giant snuggly blanket?

• atmosphere
• hydrosphere
• biosphere
• geosphere

Which layer of the atmosphere contains 80% of the air on the planet?

• the troposphere
• the stratosphere
• the mesosphere
• the exosphere

Which layer of the atmosphere is the coldest?

• the troposphere
• the stratosphere
• the mesosphere
• the exosphere

In which  layer of the atmosphere might you bump into some satellites?

• the thermosphere
• the stratosphere
• the mesosphere
• the exosphere

Which layer of the atmosphere is the highest you can go and still be on Earth?

• the troposphere
• the stratosphere
• the mesosphere
• the exosphere