Match the following. 1. active fault

2. area of new crust formation

3. layers of deposited material

4. wind, rain, glaciers

5. observational science

6. sub-ocean mountain range

volcano
mid-ocean ridge
San Andreas
geology
erosion
sedimentary rock

What is the difference between external & internal migration

How many countries have portuguese as a national language?

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