Acommon mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.

In iceland, the mid atlantic ridge runs through the center of the contry. what can you conclude about the apperence of iceland many thousands of years from now?

The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important

What term describes a doctor who becomes a specialist by meeting standards beyond those of getting a license and passing a test in the specialty area?