Pumice is an example of extrusive igneous rock. ... When lava erupts from a volcano, it can be as much as 10 times hotter than boiling water!

Igneous rocks are the "new kids" in the rock cycle. They're the new rock on the block, ready to start fresh. Basalt lava flow in Hawaii, a perfect example of an extrusive igneous rock.

In my last column, I wrote about the locations where you can find igneous rocks that were formed from lava. The metarhyolite and metabasalt described in the column are known as extrusive rocks ...

Extrusive igneous rocks are formed by magma that has erupted onto the surface as lava and then cooled quickly. Obsidian is an example of an extrusive igneous rock.

What type of rocks are thundereggs. There are three types of rock: igneous, metamorphic, and sedimentary.Thundereggs form ...

A recent study changes the understanding of how the Hawaiian Islands formed. Scientists have determined that it is the eruptions of lava on the surface, extrusion, which grow Hawaiian volcanoes ...

Two hours west of Portland on the outskirts of the Mount Hood National Forest, a 7,700-year-old mound of lava rocks rises 164 feet above the Hood River wine country. Stretching more than 4 miles ...

The Rock Cycle is Earth's great recycling process where igneous, metamorphic, and sedimentary rocks can all be derived from and form one another. Analogous to recycling a Coke can, where an old ...

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