An important tool in understanding the actual numerical dates of past geologic events is radioactivity.
Answer:
The answer is A. C. and D.
Include or not include trace gases?
It is igneous rock. When magma cools, it solidifies into a rock called an igneous rock. They are formed when the hot, molten rock rises to the surface, it undergoes changes in temperature and pressure that causes it to cool, solidify and crystalize. Hope this helped you :)!
