The is the large island south of Cuba's western side that is part of the country of Cuba.

Witch layer of the atmosphere has the most air pressure

What are seismic dampers and why are they important?

Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite