The answer is D, noble gases are stable.
Obsidian is volcanic glass compared to other igneous rocks , there’s also no proper crystallization compared to the other igneous rocks
Answer:P and S waves do refract more abruptly when they pass through the major transition zones separating the layers of the Earth. ... The Moho shows up in seismic data as a distinct change in wave speed due to a change in density of the rock across this boundary.
Explanation:
Answer:
1. D
2. A
3. Not sure, don't know what the images are.
4. Same as 3.
