Which of the following is not a true statement about the hardness of a mineral?
A) If you owned a drilling operation that was drilling into the Earth, you would find out that the temperature within the crust rises approximately 30°C for every kilometer you drill in depth
B) Melting of rocks can occur between depths of 100 and 350 kilometers causing magma to form
C) The depth of magma melting is important to the minerals that form and ultimately to the chemistry of the igneous rock that is formed
D) Quartz crystallizes at temperatures around 1100°C so it is not a common igneous mineral since super hot magma temperatures are currently rare on Earth

Question

Quizplus · Accepted Answer

Quartz is actually a common igneous mineral, and it crystallizes at much lower temperatures than 1100°C, typically below 800°C. This makes it a prevalent component of many igneous rocks.

Which of the Following Is Not a True Statement About