Answer:

1. Scientists use waves to study the different layers of the earth. Usually, they use seismic waves, which are waves generated by earthquakes or nuclear-test explosions.

So, scientists study the path and speed of these waves through the earth to decipher boundaries and the materials that make up the layers.

2. S waves cannot pass through the liquid outer core, but P waves can. The waves are refracted as they travel through the Earth due to a change in density of the medium.

This causes the waves to travel in curved paths.

3. The inner core and the outer core are made up of similar stuff chemically (both are made mostly of iron, with a little nickel and some other chemical elements.

The difference between them is that the outer core is liquid and the inner core is solid.

Explanation:

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Answer:

1) discovered in 1909 that earthquake waves near the surface moved slower than earthquake waves that passed through the interior of the Earth. ... So by looking at the seismic waves from earthquakes the scientist learned about the crust and the mantle but they also learned about the outer and inner core.After the late accretion of the Earth, heat retained by the Earth resulted in the complete melting of the upper mantle, which formed a magma ocean that covered the surface of the Earth. As the Earth cooled, the magma ocean crystallised to form a widespread crust

( if medyo mababa please summarize nalang)

2) S waves cannot pass through the liquid outer core, but P waves can. The waves are refracted as they travel through the Earth due to a change in density of the medium. This causes the waves to travel in curved paths.

3) The inner core and the outer core are made up of similar stuff chemically (both are made mostly of iron, with a little nickel and some other chemical elements)--the difference between them is that the outer core is liquid and the inner core is solid.