Watery Planet

Water Cycle & Earth's Systems

Anchor phenomenon

How much water is in the world?  Hydrosphere and the roles of water

How much salt is in the ocean?  mixtures and solutions

When you turn on the faucet, where does the water come from?  Groundwater as a natural resource

Can we make it rain?  Water cycle

How can you save a town from a hurricane?  Natural disasters and engineering  

wrap up