SOLVED: Name the following rocks: 1. An extrusive rock with 40% Ca-rich plagioclase and 60% pyroxene 2. An intrusive rock with 65% plagioclase, 25% amphibole, and 10% pyroxene 3. An intrusive rock with 25% quartz, 20% orthoclase, 50% feldspar, and minor amounts of biotit | Numerade

Black Obsidian is a natural extrusive rock that occurs when lava cools so quickly that crystals are not able to form. This volcanic glass has been used by many ancient civilizations to craft weapons, mirrors, masks, and ornaments for centuries. Black Obsidian is said to be one of the oldest used minerals in human history. | Main Street Rocks

SOLVED: compare and contrast the formation of extrusive igneous rocks with intrusive igneous rocks

How do you tell if a rock is intrusive or extrusive? - TimesMojo

Is porphyritic intrusive and extrusive? - TimesMojo

火成岩的種類和形成

Ai Generated, Lava, Volcano

What's the Difference Between Volcanic and Extrusive Rocks?

Surreal Video of Mudslides Triggered by Volcanic Eruption