SCIENCE
EARTH SCIENCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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a decrease in the rate of rotation of Earth
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the gravitational pull on materials of varying densities
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variations in heating by the Sun due to Earth’s tilt
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collisions with meteors and comets
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Detailed explanation-1: -The stratification of Earth into its geologic layers was brought about by the formation of the Earth’s iron core . The iron core was generated by a combination of radioactive decay and gravitation, which raised the temperature enough for molten iron to form.
Detailed explanation-2: -The Four Layers Many geologists believe that as the Earth cooled the heavier, denser materials sank to the center and the lighter materials rose to the top. Because of this, the crust is made of the lightest materials (rock-basalts and granites) and the core consists of heavy metals (nickel and iron).
Detailed explanation-3: -The separation of Earth into layers based on density is known as differentiation. The densest material moved to the center to create the planet’s dense metallic core. Materials that are intermediate in density became part of the mantle (Figure below). Earth’s interior: Inner core, outer core, mantle, and crust.
Detailed explanation-4: -Earth’s core is the very hot, very dense center of our planet. The ball-shaped core lies beneath the cool, brittle crust and the mostly-solid mantle. The core is found about 2, 900 kilometers (1, 802 miles) below Earth’s surface, and has a radius of about 3, 485 kilometers (2, 165 miles).