Obsidian is a glassy black igneous rock. A sample of obsidian is shown. Which type of rock forms in a similar manner as obsidian but at a slower rate?
schist, which forms under extreme heat and pressure
conglomerate, which forms when different-sized sediments cement together
gypsum, which forms when water evaporates and leaves behind minerals
granite, which forms as magma cools deep underground
1 answer
granite, which forms as magma cools deep underground.
1 answer