Metamorphic rocks: Phyllite
By: Jennifer Foster
The study of metamorphic rocks is extremely fascinating for people of all ages. From professional geologists to children who monger rocks, it is always interesting to study and see how one type of rock can become another under the right circumstances. Phyllite is one such...
Metamorphic rocks: Quartzite
By: Anja Poulsen
Quartzite is a non-foliated metamorphic rock formed from sandstone and is primarily made up of quartz. Non-foliated means that quartzite does not display the banding and layers of other kinds of metamorphic rocks like slate or schist. When cut, the break will slice through the...
How global warming could affect the jet stream
By: Haley Burger
A difference of five degrees Fahrenheit may not seem too noticeable of a change in temperature, but to many biological processes on Earth, five degrees Fahrenheit can make or break natural cycles. Global warming, also known as the Greenhouse Effect is one of Earth's natural...
Metamorphic rocks: Slate
By: Cicely Richard
Slate is a metamorphic rock formed by shale-like sedimentary rocks made of clay or volcanic ash. According to Geology.com, slate is a fine-grained and layered rock that has many uses in construction because of its durability and appearance. Like other metamorphic rocks, slate’s...
Igneous rocks: Peridotite
By: B. J. Deming
Geologists describe silicate rocks that form out of magma as igneous, from the Latin word for “fiery.” That’s a dramatic origin story in and of itself, but one such rock, peridotite—named after peridot, a semiprecious gem and the August birthstone—really...
Metamorphic rocks: Marble
By: Cicely Richard
Marble is a metamorphic rock consisting of course crystals primarily from limestone and dolomite, according to the Georgia State University Department of Physics & Astronomy. The department states that pure marble composed of calcite is white. This versatile rock has been used for centuries by...
Metamorphic rocks: Phyllite
By: Anja Poulsen
Phyllite is a fine-grained, foliated metamorphic rock. The name "phyllite" is derived from the Latin, meaning “leaf-stone”. The name probably refers to its usual green color and its ability to be flaked into thin sheets. Phyllite has a marked fissility, meaning that the rock...
Igneous rocks: Peridotite
By: J. Lang Wood
Peridotite is an igneous type of rock that is composed primarily of olivine. Peridotite has a coarse grain and may contain small amounts of other elements, such as spinel, chromite and plagioclase and amphibole. Peridotite is abundant on Earth and has a number of uses...
How earthquakes are caused
By: Sarah Cagle
Figuring out the cause of earthquakes has puzzled scientists for centuries. In fact, today they still only have theories about the exact cause of earthquakes. While they know a lot about the general cause of earthquakes, they know very little about their precise origins. In...
By: Michael Totten
A seamount is an undersea mountain which has not breached the ocean surface. Most seamounts are extinct volcanoes, but some, such as Lohi in the Hawai'ian archipelago, are still active. If a seamount grows above the ocean surface, it becomes an oceanic island. Definition Strictly...

 

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