Which of the following was true about the Protoearth?
A) Protoearth's size was smaller than today's Earth.
B) Protoearth had one large ocean.
C) Protoearth had early primitive life forms.
D) Protoearth's deep structure was homogeneous.
D
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From where does the energy contained in a mature thunderstorm originate?
What will be an ideal response?
____________________ scattering is most noticeable when particles of dust, salt, or smoke are about the same size as the wavelengths of visible light (or between about 0.1 and 1 µm)
Fill in the blank with correct word.
Clay is an example of ________
A) a carbonate that forms from weathering of other carbonates B) a silicate that forms from weathering of other silicates C) a halide that forms from weathering of other halides D) a sulfate that forms from weathering of other sulfates
What elemental compound comprises up to 95% of the mass of a diatom's cell wall?
a. silica (SiO2) b. calcium carbonate c. magnesium carbonate d. calcium sulfate e. sodium bicarbonate