Earth's continental crust is made of igneous, metamorphic, and sedimentary rocks and is composed of SIAL elements. The continental crust is made of various layers and has a density of 2.83 g/cm, while the oceanic crust is about 2.9 g/cm.

The ontientla crust has usual thickness of 40 km (25 miles) thick and floats or rests on upper mantel or i.e the asthenosphere. While other parts of it lies within the mantel the depth of the continental crust ranges to 100 km,

where r/25 = 2.7 / 3.2
r/25 = 0.82
r= 0.82 x 25
r= 20.46
25 - 20.46 is 4.54 km.

7 0

3 years ago

1.) What kind of evidence do scientists use to locate boundaries of plates and interpret what type of boundary is present?

raketka [301]

I think 1 is C. I think 2 is D. I think 3 is FALSE. I really am not sure. Sad because we just learned this.

7 0

3 years ago

Which of the above boundaries can produce volcanoes?

kykrilka [37]

Convergent boundaries or destructive plate boundary due to subduction, is an actively deforming area where two or more tectonic plates of the lithosphere move towards one another and collide. As an effect of pressure, plate material and friction melting in the mantle, volcanoes and earthquakes are common near convergent boundaries. Subduction or continental collision is created when two plates move towards one another, depending on the nature of the involved plates. During these collisions (between two continental plates) Himalayas and large mountain ranges are formed.

4 0

3 years ago

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