Show:
water treatment and disposal
Geological Features at Sea and Land
Rivers
100
fish, garbage and other debris
what do large screens keep out?
100
when hot lava erupts
when are volcanoes formed?
100
small rivers or streams
What are tributaries?
200
man made pond
What is a reservoir?
200
seamount
what are under ground volcanoes called?
200
an area surrounded by high land
What is a watershed?
300
layers of sand, gravel and charcoal
What is water forced through?
300
volcanic islands
what are guyots?
400
to kill microorganisms
why is chlorine added to the water?
400
very deep steep-sided drops in the ocean
what are trenches?