Word Root of usual. The Latin word Å«tÄ«, meaning âto use,â âto possess,â or âto enjoy,â and its form Å«sus give us the roots ut and us. Words from the Latin Å«tÄ« have something to do with use. To use is to possess and enjoy. To abuse is to use something incorrectly or unfairly.
Igneous Rock Facts. Enjoy our igneous rock facts for kids. Find interesting information and a range of examples that help explain what igneous rocks are and what makes them different from other kinds of rocks. Igneous rock is formed when magma cools and solidifies, it may do this above or below the Earth's surface. Magma can be forced into rocks, blown out in volcanic explosions or forced to the surface as lava. The atoms and molecules of melted minerals are what make up magma.
When most people think about igneous rocks they envision a volcano erupting pumice and lava. The term igneous comes to us from the Latin word  Ignis  which means fire. Igneous rocks are produced this way but most igneous rocks are produced deep underground by the cooling and hardening of magma.Magma is molten (melted) rock under the surface of the Earth. It is produced in the upper reaches of the mantle or in the lowest areas of the crust usually at a depth of 50 to 200 kilometers.hen lava reaches the surface of the Earth through volcanoes or through great fissures the rocks that are formed from the lava cooling and hardening are called extrusive igneous rocks. Some of the more common types of extrusive igneous rocks are lava rocks, cinders, pumice, obsidian, and volcanic ash and dust.