Explanation:
From the studies done on seismic elastic waves, it has been discovered that the innermost core of the earth is a solid concentric layer. Seismic P and S waves can be propagated through solids but the s-waves are cut off in contact with a liquid medium. This is because s-waves are shear waves and fluids do not shear.
- At the outer core, the s waves is cutoff and it reappears in the region of the inner core.
- This shows that the inner core is solid.
- The inner core is made up of iron and nickel with some other siderophiles.
- At the inner core, the pressure is very great. Pressure here is about 350gigapascal.
- This huge pressure compresses matter into solids despite the very high temperature.
- Also, during the differentiation of the earth, the heavier minerals moves downward to the core due to their density. Metals in the core have density of about 13g/cm³.
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Answer:
Acid base
Red litmus - color doesn't change Color change to blue
Blue litmus- color change to red. Color
doesn't change
Explanation:
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Answer:
Ophthalmoscopy, also called funduscopy.
Answer:
As pressure increases, volume of an object tends to decrease.
Explanation:
