About 3% of the water on earth is freshwater. only about 40% of that freshwater is available for human use. why is so much freshwater unavailable for human use? a) it is frozen. b) it is polluted. c) it is salt water. d) it is in aquifers. 2) the deepest place in the seafloor is called the a) abyssal plain. b) marianas trench. c) aleutian trench. d) hydrothermal vent. 3) tides are caused by a) gravity. b) heat. c) waves. d) winds.

Anyone who's in connections academy chemistry b have the factors that affect the rate of a reaction portfolio already done?

Ascientist wants to know how individual lions within a pride interact with each other in their own environment. to do this, the scientist sedates and tags all of the lions within a pride. then, he places several remotely-controlled video cameras near the lions' den and performs an observational field study. he collects continuous video footage over the span of one year, analyzes the video, and then forms conclusions based on his observations.

Which method would be best to separate a mixture of sand and gravel