Igneous or Sedimentary?

Play Quiz

Study Flashcards

Spaced Repetition

Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Download our mobile app to listen on the go

Get App

<p>Obsidian (B)</p> Signup and view all the answers

<p>Basalt (D)</p> Signup and view all the answers

Flashcards are hidden until you start studying

Obsidian is an igneous rock that is black, glassy, and breaks like glass.
It forms from rapid-cooling lava that has a lot of silica and does not have time to form crystals.
Limestone is a sedimentary rock that is usually white, gray, or tan and may contain fossils.
It forms from a chemical reaction in seawater that makes lime mud that sinks to the bottom of the limestone.
Basalt is an igneous rock that is dark gray to black, fine-grained, and hard.
It forms from a magma rich in iron and magnesium and poor in silica, which erupts from a volcano or fissure.
Diorite is an igneous rock that is medium to dark gray, coarse-grained, and dark-colored.
It forms deep in the Earth's crust from cooling magma that does not contain a lot of quartz or light-colored minerals.
Dolostone is a related rock to limestone that is composed of the mineral dolomite and does not fizz with vinegar.
Basalt may contain gas bubbles and is sometimes called vesicular basalt.