Answer:
D-Obsidian: it is an igneous rock often found in coastal areas, quickly cooled lava from volcanoes.
Explanation:
Obsidian has no crystals because it cools so quickly: it is called natural glass.
The study of rocks is called petrology
The correct answer is D
Hint to check the type of rock is to check the area and near places around it.
The area is the coastal area which has a volcano around it and forms volcanic rocks.
The option is absent in the question. Hence, in my opinion, the rock in the field trip is Obsidian
It is an igneous rock often found in coastal areas, quickly cooled lava from volcanoes and Obsidian has no crystals because it cools so quickly: it is called natural glass.
For more information, refer to the link:-
https://brainly.com/question/13899929
