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Greenhouse effect
The greenhouse effect is the process in which the emission of infrared radiation by the atmosphere warms a planet's surface. The name comes from an analogy with the warming of air inside a greenhouse ... > more -
Mount St. Helens
Mount St. Helens is an active stratovolcano in Skamania County, Washington, in the Pacific Northwest region of the United States. It is located 96 miles (154 km) south of the city of Seattle and 53 ... > more -
Hayward Fault Zone
The Hayward Fault Zone is located in northern California in the San Francisco Bay Area. It is parallel to and east of its more famous (and much longer) sister fault, the San Andreas ... > more -
Volcanic rock
Volcanic rock is an igneous rock of volcanic origin. Volcanic rocks are usually fine-grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts ... > more
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