Hard rock music is an enduringly popular genre, but what is hard rock? Explore the history of hard rock and learn about different hard rock artists.

Learn the basalt definition and understand what basalt is. Understand why basalt is an igneous rock, discover the formation of basalt, and explore basalt uses.

Granite is a hard igneous rock with coarse, visible quartz crystal grains. Granite is a rock, which means it is not one mineral but is made up of several minerals.

Learn about the rock life cycle. Identify the differences between igneous, sedimentary, and metamorphic rocks, and learn how the rock cycle works. Learn some examples of each type of …

Igneous rocks are hard bodies of rock that are resulted from the cooling and solidification of magma. Some of the common examples include basalt, granite, rhyolite, and diorite.

Learn about volcanic rock composition and formation. Explore volcanic rock types, including igneous rock, and study examples of the most common volcanic rocks.

Limestone is a sedimentary rock. It forms from compaction of components that contain calcium carbonate, cementation of calcium carbonate, or evaporation of water containing calcium …

Sandstone is a sedimentary rock composed of sand sediments that were fragmented from pre-existing rocks and minerals through physical weathering actions such as wind, gravity, and …

What type of rock is anthracite coal? Anthracite, also known as "hard coal," is a black, shiny, and hard metamorphic rock formed under intense pressure and temperature. It has the highest …

Is slate a hard or soft rock? The hardness of slate depends on its individual composition and formation, but this tends to range from 2.5-4 on the Mohs hardness scale.