How is the composition of Earth's present-day mantle used to support the magma-ocean hypothesis?
What will be an ideal response?
The fact that the composition of Earth's present day mantle is poor in strongly iron-seeking elements, rich in slightly iron-seeking elements and has intermediate concentrations of moderately iron-seeking elements is consistent with the magma-ocean hypothesis.
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Our ears are best at hearing
A. infrasonic sound. B. ultrasonic sound. C. both of these D. none of the above
Entrainment is especially active along the edges of growing clouds because
A) saturated air enters rising air parcels, causing evaporation B) unsaturated air enters rising air parcels, causing evaporation C) saturated air enters rising air parcels, preventing condensation D) saturated air enters rising air parcels, increasing turbulence
If you are a sunbather sitting high and dry on a beach, sipping your drink and watching the waves roll in, you are on ________
A) the foreshore B) the shoreline C) a backshore berm D) any of the above
What is globalization? What are its most significant elements?
What will be an ideal response?