Description

you will write one blog post on a current event that deals with one of the learning objectives of the module for this week. The information for the blog can be from newspapers, magazines, research papers, etc. In addition to writing one blog post, you will also read and comment on one of your peers’ blogs. Your original blog post and peer responses are to be no more than 300 words and included a title. You will be given a grade for your posts and peer responses each week.

You are encouraged to use images and videos to enhance your blog but ensure that proper citation and credit is given to the owners of the images and other materials used if you are not the original author.

Post 1:

Metamorphic Rocks: Properties & Locations

Metamorphic rocks are created when high temperatures and pressure act on a rock to change its physical and chemical properties (since metamorphism means ‘to change form’). As the rocks cool, these conditions usually stretch, twist, and fold them. In metamorphic rocks, some or all of the minerals in the original rock are replaced to form new minerals. There are two main types of metamorphic rocks, foliated ones and non-foliated ones. Foliated rocks form a sheet-like structure that reflects the direction that pressure was applied in. Slate, gneiss, and schist are a few examples of this type. Non-foliated rocks, on the other hand, have individual mineral grains that do not align. The reason for this is because these specific rocks are created by intense heat instead of pressure. Examples of non-foliated rocks include marble, quartzite, and hornfels.

Metamorphic rocks are found most frequently in mountainous regions, though they can likely be found wherever there are signs of geological upheaval in an area. Metamorphic rocks are also often located near living or extinct volcanoes, since the heat caused by magma venting from the volcano can cause chemical reactions that trigger rocks to undergo metamorphosis. Besides general locations of metamorphic rocks in nature, there are also many parks where these rocks can be seen, including Death Valley National Park in California/Nevada, Grand Teton National Park in Wyoming, and Rocky Mountain National Park in Colorado.

The top image is a foliated gneiss rock and the bottom image is a non-foliated soapstone rock, to give a visual of how these types look side-by-side.

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