GEOLOGY

EARTH SCIENCE

VOLCANOES

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The Earth is made up of four layers. From the inside out, there is the inner core, outer core, mantle and crust. The core is about as hot as the surface of the sun. Heat energy from the core is constantly trying to escape. This energy continually pushes outward toward the mantle and crust. The crust usually keeps the mantle contained below, but not always! Earth’s crust is broken up into about 15 different pieces called tectonic plates. The boundaries between these plates are called faults. At these fault lines, magma-molten rock from the mantle mixed with hot gas-can build up. Volcanoes are openings in the ground found at these fault lines. When the pressure beneath Earth’s surface becomes too much, magma releases from deep inside the Earth through a volcano. Once it reaches Earth’s surface, magma is called lava.Which of the following best describes the relationship between Earth’s crust and tectonic plates?
A
Earth’s crust is one large tectonic plate.
B
Earth’s crust is found between the outer core and tectonic plates.
C
Earth’s crust is made up of separate pieces called tectonic plates.
D
Earth’s crust sits above tectonic plates, which are suspended in the mantle.
Explanation: 

Detailed explanation-1: -The structure of the earth is divided into four major components: the crust, the mantle, the outer core, and the inner core. Each layer has a unique chemical composition, physical state, and can impact life on Earth’s surface.

Detailed explanation-2: -Inner Core. The inner core is the deepest layer on Earth.

Detailed explanation-3: -The inner core’s intense pressure-the entire rest of the planet and its atmosphere-prevents the iron from melting. The pressure and density are simply too great for the iron atoms to move into a liquid state.

Detailed explanation-4: -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).

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