How are igneous rocks formed?
a. heat and pressure from nearby magma changes existing rock.
b. lava or magma cools and then crystallizes.
c. sediments deposit in a lake and turn to stone.
d. lava or magma heats up and crystallizes.

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.