What is corundum? If it is not in the rare form described here, do we use it for anything?
What will be an ideal response?
Answer: a hard mineral, sandpaper
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When lightning strikes, nitrogen molecules, N2, and oxygen molecules, O2, in the air react to form nitrates, NO3-, which come down in the rain to help fertilize the soil. Is this this an example of oxidation or reduction?
A) The formation of nitrates is an example of oxidation. B) The formation of nitrates is an example of reduction. C) Both. The nitrogen is oxidized as it reacts with the oxygen while the oxygen is reduced. D) Neither. Although the bonds of both the N2 and O2 molecules are broken to form the NO3-, neither oxidation nor reduction occurs.
Viscosity (i.e., resistance to flow) of magma is controlled by factors different from those affecting the explosivity of volcano eruption.
a. true b. false
The Great Lakes are large enough to affect the climate of the surrounding area
Indicate whether the statement is true or false
If the axis of the Earth were not tilted, Earth would not experience ________
A) day/night variations B) rotation C) aphelions D) perihelions E) seasons