1. How much salt can freshwater contain?
a. 5%
b. 0.1%
c. 0.5%
d. 1%

2. How much of the planet's water is freshwater?
a. 3%
b. 50%
c. 1%
d. 97%

3. How much of our planet's water is accessible for us to use?
a. 97%
b. less than 1%
c. 2%
d. 3%

What is the "great pacific garbage patch"? (a) a large area of marine debris concentrated by rotating ocean currents (b) a large area around the pacific rim where debris collects from natural disasters such as tsunamis (c) an area in the pacific ocean where trash is intentionally dumped due to lack of landfill availability (d) a large trash dump located in hawaii

The pacific plate is an oceanic tectonic plate. how did a hot spot and the pacific plate interact to form the hawaiian islands?

During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic