World Geography

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In the structure of planet Earth, below the mantle, the core is mainly made up of_____?

A)

aluminium


B)

silicon


C)

chromium


D)

iron



Correct Answer :

iron


Explanation :

The planet is made up of three main shells: the very thin, brittle crust, the mantle and the core.
The core forms only 15 percent of the Earth's volume, whereas the mantle occupies 84 percent.

The core is made primarily of iron.

Magma that reaches the Earth's surface and then solidifies is called________?

A)

quartz


B)

lava


C)

granite


D)

silicates



Correct Answer :

lava


Explanation :

volcano an opening in the earth's crust through which magma or gases can erupt onto the surface. When magma reaches the surface from beneath water or air, it is called lava.

Isotherms are the lines of equal_______?

A)

pressure


B)

temperature


C)

rainfall


D)

height



Correct Answer :

temperature


Explanation :

A line connecting points of equal temperature is called an isotherm.

Which of the following gases in the atmosphere absorbs heat from the Sun’s radiation and the Earth's surface?

A)

Neon


B)

Carbon dioxide


C)

Argon


D)

Nitrogen



Correct Answer :

Carbon dioxide


Explanation :

Water vapor, carbon dioxide, methane, and other trace gases in Earth's atmosphere absorb the longer wavelengths of outgoing infrared radiation from Earth's surface. These gases then emit the infrared radiation in all directions, both outward toward space and downward toward Earth.

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