Acid precipitation is caused by a mix of:
a. respiration, carbonic acids, and seawater
b. sulfur dioxide, carbon dioxide, nitrogen oxides
c. hydrogen, oxygen, and saline
d. water, soil, and air

What statement about charlemagne is not true? a. charlemagne's empire collapsed during his rule b. charlemagne sent missionaries throughout europe c. charlemagne encouraged the arts and education d. charlemagne ruled much of western europe a. charlemagne's empire collapsed during his rule

Is an official language in every north african country

Look at the diagram showing the different wavelengths in sunlight. which statement describes electromagnetic waves with wavelengths greater than 700 nanometers? they take the form of heat. they can cause skin cancer and sunburn. they are some of the shortest waves. they can be seen by human eyes as visible light.