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Stels [109]
3 years ago
13

5. Describe the three types of magma. Include the silica content and explosivity

Geography
1 answer:
777dan777 [17]3 years ago
8 0

Answer:

Basaltic magma --  SiO2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na

Andesitic magma --  SiO2 55-65 wt%, intermediate. in Fe, Mg, Ca, Na, K

Rhyolitic magma --  SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na

Explanation:

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steposvetlana [31]

Answer: A

Explanation:a force is baisicly a vector that has a certain direction and magnitude the more magnitude it has in the direction its pulling the faster the object effected by it will go to it. it seldom is the stregnth with most forces it just depends on magnitude

3 0
3 years ago
Which of the following can be used by scientists to date the sediment layer they are found in? Select all that apply
Fantom [35]

<u>Answer:</u>

All of the above mentioned options can be used by scientists to date the sediment layer they are found in.

<u>Explanation:</u>

  • Rock fossils, animal fossils, etc.found in the sediment layer can be used to determine the age of the sediment based on the period of the existence of that animal or the period of formation of the rock.
  • Tree rings clearly exhibit the age of the tree. Hence, a sediment layer with the evidence of tree rings can tell the age of the sediment layer.
  • An amalgamation of the data obtained from the animal growth rings and the period of existence of that specific animal species can be used to calculate the age of the sediment.
  • The intensity of radioactivity left in the isotopes clarifies how old the isotope is.
  • The age of mineral elements can be determined exactly with the help of processes like Potassium-Argon dating, Uranium-Lead dating, etc.
  • Thus it would be easy to determine the age of the sediment layer containing mineral elements.
7 0
3 years ago
When might engineers use a topographical map?
Luba_88 [7]
I'm unsure but perhaps the answer is <span>to show the shape of the earths surface.

Hope this helps !

Photon</span>
5 0
3 years ago
What country spans both Europe and Asia?
hodyreva [135]
Russia. It is the largest country in the world. 90% of Russia is in Asia and the rest in Europe.
7 0
2 years ago
Which mountain ranges are in the Alpachian Mountains
garik1379 [7]

hi hi hi ok what do u want

8 0
3 years ago
Read 2 more answers
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