Sedimentary rocks are formed by a natural process known as ___?

a) Lithification

b) Rejuvenation

c) Hydration

d) Peroxidation (more…)

The Greenhouse Effect is caused by an excess of:

a) Carbon monoxide

b) Carbon dioxide

c) Carbon tetra chloride

d) None of these. (more…)

What does PDF stand for?

a) Personal Document Format

b) Pure Document Format

c) Private Document Format

d) Portable Document Format (more…)