This is the greatest source of oil in the marine environment?

This is an important herbivore in kelp forests?

This is what we call depths of 4000-6000 meters?

This was our most recent super continent?

Which of these elements makes up 95% of the body weight of organisms?

This is what we call the area between mean low tide and mean high tide?

At what temperature is water most dense?

This is a semi-enclosed area where fresh water and seawater meet and mix?

This is the amount of heat energy required to produce a unit change in the temperature of a material?

At what temperature does water freeze?