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Vlada [557]
3 years ago
9

Which option best completes the paragraph below?

Geography
1 answer:
mariarad [96]3 years ago
6 0
The answer is C. reduction/ soil/ product
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Tectonics and the Origin of Magma the Earth Works: Examining Plate Tectonics st is: 8 What causes the tectonic plates to move? A
Travka [436]

Answers:

1- Option (D)

2- Option (C)

3- Option (D)

4- Option (B)

5- Option (A)

6- Option (B)

7- Option (C)

Explanation:

  • The lithospheric plates float over the viscous layer of the asthenosphere due to the initiation of convection current in the mantle. These currents are formed because of the heat that is radiated from the core of the earth.
  • In a divergent plate boundary, the two plates move away from one another. Due to this, seafloor spreading takes place and leads to the eruption of magma forming a ridge which is commonly known as the Mid-Oceanic ridge. Here, new materials are added to the crust.
  • When the continental plates are stretched and pulled apart due to the extensional force, it results in the formation of a rift, and gradually with time, it forms a rift valley. This rift valley later give rise to the formation of seas and oceans due to the tectonic activities.
  • The oceanic crust is made up of denser basaltic rocks containing a high amount of magnesium, calcium, iron, and aluminum, whereas the continental crust is comprised of less dense granitic rocks containing silicate minerals, feldspar. So the oceanic crust is denser than the continental crust.
  • The thickness of the continental and oceanic crust is about 35-45 km and 5 to 10 km respectively. Hence, the continental crust is very thick.
  • The hotspots are the regions that are comprised of mantle plumes, where the magma is so intense that it rises up to the surface forming volcanoes or volcanic landforms.
  • The ice floating over water is similar to that of the moving of the crusts over the mantle. The thickness and density, both play a significant role in keeping the crust at the top of mantle maintaining the state of equilibrium. This is known as isostasy.
4 0
3 years ago
Why are fossils usually found in sedimentary rock instead of igneous or metamorphic rock?
amid [387]

Answer:

it is because, igneous and metamorphic form at temperatures and pressures which destroy the fossil remains. dead organisms may become sediments which may, under right conditions, become sedimentary rocks

7 0
3 years ago
Renewable resources have disadvantages.
Gnesinka [82]
The only disadvantage I could think of would be price of equipment needed to produce energy from the source (i.e. price of solar panels)
8 0
3 years ago
Read 2 more answers
The area of ΔABC is 2.5 square inches. If side AB is considered the height of the triangle, what is the length of the base?
Triss [41]
2.5 because there the same arent they
8 0
3 years ago
Which two major geographic features provided the east and west boundaries of this piece of land
FrozenT [24]

Answer: The two major geographic features provided on the east and west boundaries of piece of land are:

1. The land is "Louisiana Purchase".

2. The east boundary is "Mississippi".

3. The west boundary is "The Rockies".

Explanation: The Louisiana purchase is a piece of land of about 530,000 acres which was sold by France to the US President which was Thomas Jefferson in 1804.

6 0
3 years ago
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