Discussion and Response on the Geochemistry of the Atacama Desert
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Discussion and Response on the Geochemistry of the Atacama Desert
Overview of the subject
This week, we’ll look at two very different sorts of Earth environments: deserts and glaciers. Deserts, or areas with very little precipitation, cover about 30% of the earth’s
surface area. Many desert regions are found between 30° north and 30° south latitude, in an area with high air pressure. Some deserts are found under rain shadows, which
are arid areas on the leeward side of mountain ranges.
Water is the primary element that moves sediment and shapes landforms in many deserts, despite the fact that they are extremely dry. Many deserts undergo flash floods, which transport a large amount of sediment along with stream systems. Arroyos, alluvial fans, bajadas, playas, and inselbergs are some of the landforms found in deserts.
Because the dry soils have little flora to hold them in place, the wind is a major cause of erosion in deserts. Sand dunes are the most striking wind-created desert formations.
The amount of sand available and the number of wind directions transporting the sand influence the formation of various types of dunes.
Where the amount of snowfall in the winter exceeds the amount of snowmelt in the summer, glaciers form. The weight of the overlying snow compresses the lower layers of snow into glacial ice as it builds year after year. Glaciers flow from an accumulation zone to a melting zone.
Alpine glaciers are found in high-elevation mountain ranges. They’re only found in mountain valleys that were once home to streams. Alpine glaciers have a significantly
greater erosive potential than streams, therefore their valleys deepen and broaden. Arêtes, horns, glacial troughs, and hanging valleys are all created by these glaciers.
Continental glaciers are large ice sheets that span large swaths of land. Greenland and Antarctica have the world’s two greatest ice sheets at the moment. Ice has covered
significantly larger regions of the planet during frigid eras in Earth’s history.
Moraines are glacial deposits made up of unsorted material known as till. Glacial till contains a wide range of sediment sizes, from tiny clay to big boulders, because they are
all produced at the same time as the ice melts.
Mini-lessons:
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https://mediaspace.regis.edu/media/Glaciers/1 nap4usj1
Post for discussion:
Aridity and Deserts
The aridity of a desert region can be caused by a number of causes. A desert, for example, may be dry due to its location in a subtropical high-pressure area or because it is in
the rain shadow of a major mountain range. Choose one of the world’s deserts and describe the elements that cause it to be dry. Describe the location of the desert, the
direction of the prevailing winds, and the landforms that influence its aridity.
Reply to a post made by a classmate.
Bella Holman, w6
The Sonoran Desert is the world’s desert that I’ve chosen to discuss. This desert is mostly found in Mexico, with two-thirds of it in Baja California and Sonora. However, it can
also be found in the United States, in the southern section of Arizona and southeastern California (The Sonoran Desert). The scorching temperatures that regularly reach 104 to 118 degrees Fahrenheit, the dry environment in which it is located, and the fact that it is considered an exceptionally arid location are all reasons that make this desert dry. A
series of high valleys and mountain ranges can be found in this desert. The prevalent winds are westward-moving winds that circle back into the area and eventually reach the
Sonoran Desert as southeasterly winds (Desert storms).
Storms in the desert (n.d.). https://www.desertmuseum.org/books/nhsd patternsrain.php (accessed April 10, 2021). #::text=The percent 20belt% 20of percent 20westerlies%
20shifts,Sonoran% 20Desert% 20as% 20southeasterly% 20winds
The Sonoran Desert is located in Arizona (n.d.). https://www.nps.gov/cagr/learn/kidsyouth/the-sonoran-desert.htm (accessed April 10, 2021).
Larry’s Week 6 Discussion
The Sahara Desert is the world’s largest scorching desert. The Sahara, with a surface size of 3,600,000 square miles and coordinates of 23°N 13°E, is located on the African
continent and encompasses 31 percent of the continent. These coordinates are near the Tropic of Cancer, which has a hot climate due to the dry air. The Atlantic Ocean is to
the west, and the Red Sea is to the east of this desert. The Mediterranean Sea is to the north, and the Sahel Savannah is to the south. Every 20,000 years, the climate of the
Sahara Desert shifts from savanna grassland to desert. This is due to the Earth’s axial precession as it spins around the sun. The Hadley circulation is one of the main reasons why the Sahara is so hot. The tropical atmosphere rises from the equator and drops into the subtropics, creating desert-like conditions such as those found in the Sahara. This
mechanism eventually regulates rainfall patterns, resulting in the Sahara receiving just approximately 250mm of yearly rainfall. The rain shadow effect contributes to the
dryness in the Sahara. This effect is caused by and contributed to by two major mountain ranges. The Atlas Mountains in the north and the Ethiopian highlands in the south are
responsible for the Sahara’s climate drying up. Incoming rain clouds are being obstructed, causing dry air to be forced into the desert. The dryness of the Sahara is also due to
coastal cooling.
Matthew Gaffney (Week 6)
The Gobi Desert will be the subject of my discussion. This vast desert, which stretches across much of northern China and Mongolia, is one of the most desolate regions on the planet. The aridity of the Gobi is due to two main factors: air pressure and rain shadow. The Gobi is a frigid desert due to high air pressure. The Gobi’s elevation is another
aspect contributing to the cold. The dunes are frequently blanketed in frost or snow. The desert was produced as a result of its location in the Himalayan rain shadow. The westerlies are the dominating wind in the region, which has resulted in the Gobi’s current landforms.
Discussion and Response on the Geochemistry of the Atacama Desert
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Average Score
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Review of relevant theoretical literature is evident, but there is little integration of studies into concepts related to problem. Review is partially focused and organized. Supporting and opposing research are included. Summary of information presented is included. Conclusion may not contain a biblical integration.
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Discussion and Response on the Geochemistry of the Atacama Desert