Igneous rock are classifies as either volcanic rock or plutonic rock.
They destroy things that cost lots of money to repair, or they put people in hospitals, and that would cost a lot of money too.
Answer:
conservation is saving and reducing. To help save the earth .. Conservation is the preservation or efficient use of resources,
Explanation:
What percent of potassium-40 remains undecayed in a rock that is 3.9 billion years old? The 3.9 billion year old rock has undergone three half-lives (3.9 divided by 1.3 = 3). After 3 half-lives, 12.5% of the potassium-40 remains undecayed.
