Multiple Choice
Which molecule commonly found in CFCs and HCFCs is primarily responsible for ozone depletion in the stratosphere?
34
views
1. Intro to General Chemistry
Chemical Properties
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which of the following best describes the role of water and other volatiles in the formation of magma?
A
They have no significant effect on the melting or formation of magma.
B
They lower the melting point of rocks, facilitating magma formation.
C
They act as catalysts that speed up the crystallization of minerals in magma.
D
They increase the density of rocks, making magma formation more difficult.
Verified step by step guidance1
Understand that water and other volatiles are substances that can be dissolved in rocks under high pressure and temperature conditions within the Earth's mantle and crust.
Recognize that the presence of water and volatiles affects the melting behavior of rocks by interacting with their mineral structures.
Recall the concept of melting point depression, where the addition of certain substances (like water) lowers the temperature at which a solid melts.
Apply this concept to geology: water lowers the melting point of rocks, meaning that rocks can melt at lower temperatures than they would if they were dry.
Conclude that this lowering of the melting point by water and volatiles facilitates the formation of magma by making it easier for rocks to melt under geological conditions.
Related Videos
Related Practice
Chemical Properties practice set
Problem sets built by lead tutorsExpert video explanations