UNIVERSE
PLANETARY INTERIORS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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evaluations of seismic data
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direct observations of the layers
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samples of rocks from the layers
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explanations of the rock cycle
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Detailed explanation-1: -Scientists can tell by observing the seismic waves that are recorded all over the surface of the earth from distant earthquakes. The seismic waves are reflected (bounced off) layers of different density, and they are refracted (bent) when they enter layers of different density.
Detailed explanation-2: -The inner core is a hot, dense ball of (mostly) iron. It has a radius of about 1, 220 kilometers (758 miles). Temperature in the inner core is about 5, 200° Celsius (9, 392° Fahrenheit). The pressure is nearly 3.6 million atmosphere (atm).
Detailed explanation-3: -We can learn to minimize our risks from earthquakes, volcanoes, slope failures, and damaging storms. We can learn how and why Earth’s climate has changed in the past, and use that knowledge to understand both natural and human-caused climate change.
Detailed explanation-4: -Hydrogen is the most abundant element in the universe, accounting for about 75 percent of its normal matter, and was created in the Big Bang. Helium is an element, usually in the form of a gas, that consists of a nucleus of two protons and two neutrons surrounded by two electrons.