An igneous rock that cools rapidly is likely to have ________ crystals.

How can the extinction of bird species create a ripple effect through the rest of the ecosystem?

What will be an ideal response?

The relatively small volcanic feature that consists of solidified lava and some volcanic ash is a

A) cinder cone. B) shield volcano. C) composite volcano. D) caldera. E) None of these are correct.

Who was responsible for most of the progress in science and math after the fall of the Roman Empire?

a. Arabs b. Greeks c. Asians d. Vikings

The first comprehensive national law to manage water quality was the ________

A) Clean Water Act B) Safe Drinking Water Act C) Water Pollution Control Act D) Clear Drinking Water Act E) Oil Pollution Control Act