An curved arrow pointing right. Adding relatively minor factors like crystals, water, ice, and metal can drastically affect how lava moves, cools, and creates formations. When lava meets water ...

Volcanic rock and volcanic glass are formed when lava cools. During a violent volcanic explosion, magma may also be expelled into the atmosphere. Tephra, a volcanic rock formed by this magma, ...

Following is a transcript of the video. Jeff Karson: Here we go. Abby Tang: This is lava. And this is also lava. One's man-made, and one's, well, coughed up by Mother Earth. But both these ...