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Umnica [9.8K]
3 years ago
12

Describe in detail what causes seafloor spreading. Use as many key terms as possible.

Geography
1 answer:
bixtya [17]3 years ago
8 0

Answer:

Seafloor spreading results from intense activity in the upper mantle which cracks the crust and pushes it away.

Explanation:

Seafloor spreading is a process that was first noticed by Alfred Wegener and was used by him in his theory of plate tectonics. There are three types of plate boundaries; convergent boundary, transform boundary, and divergent boundary. The last one is the one where seafloor spreading occurs.

The convection currents in the mantle are the process that breaks up the crust and move the tectonic plates, and when there is higher activity than usual at some place it results in break up the crust of an already existing tectonic plate.  Basically, magma rises at a higher rate and pushes through the crust, in this case, the oceanic crust, and it manages to gradually break through it and come out on the seafloor. By doing so, the magma and the pressure from below are pushing the two now divided parts of the plate. As the space between the two different parts becomes larger and large the density of the crust becomes smaller and smaller so more and more magma rises through. The magma quickly solidifies on the ocean floor and piles up, thus creating an underwater mountain range known as a mid-ocean ridge.

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Which of the following is not a way humans have impacted the tundra? a. oil drilling b. logging c. overgrazing d. mining
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Answer:

Option (B)- Logging

Explanation:

The humans have not impacted the tundra by carrying out the logging activity as in the tundra region, there is significantly less number of trees and the temperature is relatively very cold and most of the time the land areas are covered with snow and ice. This covers the regions of higher latitudes, extending from about 60 degrees up to the poles in both the hemisphere. Due to this less abundance of trees, the logging activity is not carried out in this particular region.

Further explanation:

Logging is defined as the activity where the trees are cut down and processed and are transported to the site where they are extensively used in order to make materials such as furniture, manufacturing of paper and other products.

The tundra region is usually characterised by the presence of the permafrost layer, which is a permanently frozen layer present under the surface of the earth. They are made up of materials such as soil, sand, gravel that are accumulated together by ice.

This logging activity has a direct effect on the atmosphere. It is because the deforestation process causes a reduction in the number of trees, as a result of which the CO2 present in the atmosphere will increase the global temperature of the earth, thereby causing the greenhouse effect. Increasing logging activity also leads to soil erosion and degradation of the soil quality.

Due to the absence of the trees, the tundra region is not affected by the logging activity.

Learn more:

1. Logging and its relation with the carbon cycle brainly.com/question/784659 (answer by

W0lf93)

2. Reason behind the occurrence of less trees in the tundra region brainly.com/question/13759390  (answer by Linna3)

Keywords:

Logging, Tundra, Greenhouse effect, Latitude, Deforestation, Permafrost layer.

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