Three-fourths of the Earth's surface is covered by water. The water cycle includes these water sources evaporating and returning to Earth as rain and snow. What is the driving force behind the water cycle?
A.
the Sun
B.
the wind
C.
the tilt of the Earth
D.
the Moon

A, the sun.

Explanation:

The sun powers the water cycle and many others.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus.

this is so because calcium carbonate is the main component in the shells. calcium carbonate is strengthened by phosphorus.

explanation:

halogen, any of the six nonmetallic elements that constitute group 17 (group viia) of the periodic table. the halogen elements are fluorine (f), chlorine (cl), bromine (br), iodine (i), astatine (at), and tennessine (ts).