Scientists can't determine because it's far to fragile and hot to dig into the earth therefore we don't know exactly how it is just can give an estimate based on what we already know from the other layers
The number that Colorado River would have to downcut per year to form the mile-deep canyon in 4 million years is 0.40 millimeter per year.
Depth of canyon = 1 mile
Time taken = 4 million years
Based on the above information, the rate will be:
= Depth / Time taken
= 1 mile / 4 million years
= 0.25 mile / million year
Note tha<em>t 1 mile = 1609344 millimeter</em>
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Therefore, the rate will be:
= (0.25 × 1609344) / 1000000 years
= 0.40 millimeter / years
In conclusion, the rate is 0.40 millimeter per year.
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Let's take water: it definitely has three forms: ice, liquid and water vapor: it's definitely the correct answer!
Wind is just movement of air, so it can't be in any other state.
And as far as air and soil are concerned: some parts of them can also appear in three states, but not the air or soil generally, for example water is included in both of them and it can appear in the three states!
The North Star has very little apparent rotation in the night sky because: it lies directly above the Earth's axis of spin. The background stars during a solar eclipse are those of constellations: of the opposite season.
Hope this helps:)
