Calculate the number of photons having a wavelength of 375nm required to produce 1000. J of energy. A. 2.48e-28
B. 1.89e27
C. 2.84e63
D. 1.89e21

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

How have the greenhouse gasses increased from the year 2000 to 2018

In a water molecule, hydrogen and oxygen are held together by a(an) bond. a) double covalent b) ionic c) nonpolar covalent d) hydrogen e) polar covalent