Refer to Figure 13-2 and determine how much parent material will be left after five half-lives.

How do convection currents form underwater mountains?

These factors threaten north americas ecosystems

Which of the following is an important principle of how water moves through a watershed? a. most freshwater is in the form of ice. b. small streams flow into larger streams. c. each watershed contains only a single source of water. d. clouds are formed through evaporation and then condensation.