Bill Nye: Rocks and Soil

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

What are the two causes of density in deep current waters? a. salinity (how much salt) of the water and high temperaturesb. salinity (how much salt) of the water and low temperatures c. oxygen content of the water and high temperatures. d. oxygen content of the water and low temperatures

Where does the esophagus lead to in a frog?