Answer:
A. Obsidian
Explanation:
It fits the property described in the question.
It cools so fast that no visible crystal or grain could form. It has high silica Composition, black and glassy. It is also used to make tools with sharp edges
Geography is literally 'the study of Earth' from 'ge (γη)' meaning earth and 'grapho (γραφω)' to write or to study.
The ninth planet is Pluto, but this was ruled a dwarf planet in 2006. It has a small surface area than Russia.
Caspian Sea is what I got
The answer is C because the earth gets hotter as you go deeper into it therefore the continental crust which is the outside would be the coolest. The inner core is the hottest then the outer core then the mantle and then the crust would be the coolest.
The Great Lakes were formed during the last ice age.
