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zubka84 [21]
3 years ago
6

I need some help pls

Geography
1 answer:
viva [34]3 years ago
6 0
Option b the United steps test gets its long needed independence
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North America's greatest river system is the ___________.
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Explanation:

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Which of the following is a definite indicator of a chemical change?
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D. a new substance is formed. if it is chemical change then it is actually changing to something new. In this case a new substance is formed. It is a completely different substance from what you started out with. 
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Which of the following are common tectonic settings associated with volcanic activity?Select all that apply.
bagirrra123 [75]

Answer:

Options (A), (B), (C), and (D)

Explanation:

The volcanic activity refers to the eruption of magma at the surface of the ocean floor and continental land areas, forming volcanoes.

Some of the tectonic settings that are associated with volcanic activity are as follows-

  • Mantle plumes- These are the large uprising bodies of magma that are generated due to the formation of convection current in the mantle. These are localized body and are located away from the tectonic boundaries. For example, Hawaii is formed as the plates moved over the mantle plumes.
  • Continental rifts- This refers to the eruption of magma at the surface of the continents, due to the divergent motion of two continental plates. It results in the formation of a rift, rift valley and then later forms an ocean.
  • Island arcs- These are formed due to the collision of two oceanic plates, where the volcanoes are formed on the lighter oceanic plate due to the rising up of magma.
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3 years ago
Lava at Earth’s surface or ______ below Earth’s surface cools and hardens to form mineral crystals.
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Lava at Earth's surface or magma below Earth's surface cools and harden to form mineral crystals. 
6 0
3 years ago
Read 2 more answers
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