Category: Geology

What does seismic activity mean?

What seismic activity means? Seismic activity is defined as the types, frequency and size of earthquakes that happen over a period of time in a certain area. An example of seismic activity is how often earthquakes occur in the San Francisco Bay Area. noun. What is an example of seismic? The definition of seismic is

What ended the Phanerozoic eon?

What happened Phanerozoic eon? The time span of the Phanerozoic starts with the sudden appearance of fossilized evidence of a number of animal phyla; the evolution of those phyla into diverse forms; the emergence and development of complex plants; the evolution of fish; the emergence of insects and tetrapods; and the development of modern fauna.

Why is the inner core of the Earth solid and not liquid?

The inner core is solid because it is made of very dense, or heavy, materials – like iron and nickel. Even though it is very hot, these materials don’t “melt” very easily, so they stay solid. Why is the inner core a solid and not a liquid? However, unlike the outer core, the inner core

What does the Pycnocline separate?

pycnocline, in oceanography, boundary separating two liquid layers of different densities. In oceans a large density difference between surface waters (or upper 100 metres [330 feet]) and deep ocean water effectively prevents vertical currents; the one exception is in polar regions where pycnocline is absent. Why is the pycnocline important to plankton? Below the mixed

How big are the crystals in the Cave of Crystals?

36 feetup to 36 feet (11 meters) long and weighing up to 55 tons. “It’s a natural marvel,” said GarcĂ­a-Ruiz, of the University of Granada in Spain. How old are the crystals in the Cave of Crystals? about 500,000 years Stein-Erik Lauritzen (University of Bergen, Norway) performed uranium-thorium dating to determine the maximum age of

What safety equipment do volcanologists use in their work?

Most of the time when they work on a volcano, they just wear a pair of heavy boots, jeans, hat, and long-sleeved shirt to protect from sharp dried lava. They might use heavy work gloves if they are working on fresh lava flows and a rock-climbing helmet if working in an area where there is

What are fragments that make up rocks?

Textures are fragments that make up rocks. Nonfoliated metamorphic rocks form distinct, parallel layers. What are rocks called that are made of the fragments of other rocks? Clastic sedimentary rocks Clastic sedimentary rocks are composed of rock fragments (clasts) that have been cemented together. What are small fragments of rocks called? Sedimentary rocks are made

What kind of animals are in the Appalachian Mountains?

The wildlife a person might encounter in the Appalachian Mountains includes a wide variety of animals: Mammals (moose, white-tailed deer, black bears, beaver, chipmunks, rabbits, squirrels, foxes, raccoons, opossums, skunks, groundhogs, porcupines, bats, weasels, shrews, and minks) What are the creatures that live in the Appalachian Mountains? Scattered through other areas are the black bear,

What are Exogenic forces?

Exogenic (or exogenetic) factors are agents supplying energy for actions that are located at or near the earth’s surface. Exogenic factors are usually driven by gravity or atmospheric forces. The term is commonly applied to various processes such as weathering, denudation, mass wasting, etc. What are Exogenic forces explain? The forces which derive their strength

What is the type of rock formed when magma or lava cools quizlet?

Igneous rocks are formed from magma or lava that cools and hardens. What is the type of rock formed when magma or lava cools? igneous rock Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth’s surface. These are the rocks that form at erupting volcanoes and

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