46.6% Oxygen
27.7% Silicon
8.1% Aluminium
5.0% Iron
3.6% Calcium
2.8% Sodium
2.6% Potassium
2.1% Magnesium
Answers:
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1) [D]: " CO₂ " .
<u>Note:</u><u> </u> This is the only answer choice given that is composed of: "at least two different elements" .
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2) [D]: "carbon and hydrogen" {"C" and "H" .} .
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Answer:
Mantle convection is the very slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior to the planet's surface. The Earth's surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.
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