Through which material do p waves move the fastest?

a. clay
b. rock
c. water
d. sand

Of seawater increases with decrease in the temperature. therefore, the cold water sinks to the deeper layers at the bottom

Which of these is an example of land degradation? a. containers designed to store pollutants leak. b. fertilizers provide too many nutrients to crops. c. garbage is buried so the land can be reclaimed later. d. a drought kills all the plants in an area, leaving bare land

What do your cells need to live? a. carbon dioxide b. carbon c. air d. oxygen