Source: The Environmental Protection AgencyI. The Ozone Layer The Earth's atmosphere is divided into several layers. The lowest region, the troposphere, extends from the Earth's surface up to about…
MINERAL PROPERTIES MINERALS IN ROCK CRYSTALS FIND OUT MORE
Minerals are the materials that make up the rocks of the Earth’s crust. Among thousands of different minerals, only a few,…
Because of its blood-red color (which comes from iron-rich dust), this planet was named for Mars, the Roman god of war. Mars is the fourth planet from the Sun, situated between Earth and Jupiter.…
(Encyclopedia) Kurile Lake, crater lake, 29 sq mi (76 sq km), 130 mi (209 km) SSW of Petropavlovsk, Russia, near the tip of the Kamchatka Peninsula. Located in a rugged volcanic region and lying some…
(Encyclopedia) Craters of the Moon National Monument and Preserve, S central Idaho; est. 1924. The monument (53,438 acres/21,625 hectares) lies at the north end of the much larger preserve (698,940…
SOLID PARTICLESLIQUID PARTICLESGAS PARTICLESSOLAR PLASMAMELTINGBOILINGFIND OUT MOREAll matter exists as solids, liquids, or gases. These are called the states of matter. Matter can change from…
(Encyclopedia) Aleutian Range, volcanic mountain chain, c.1,600 mi (2,600 km) long, SW Alaska, extending W from Anchorage along the Alaska Peninsula, and continuing, partly submerged as the Aleutian…
