The most accepted explanation of the moon's origin is:
a. it is a remnant of the planet Saturn
b. it was formed by the collision of the Earth with a Mars-sized planetary body.
c. it is a captured asteroid.
d. it is a remnant of the planet Jupiter.
b
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What is the main hurdle to replacing our current energy system (based on gasoline and coal) with one based on hydrogen?
A. The hydrogen does not occur naturally. B. We have not developed the technology to produce it. C. Hydrogen is highly flammable. D. We haven't yet invented a system to extract energy out of hydrogen.
There is a hidden water cost when you buy a new car.
Answer the following statement true (T) or false (F)
Classify the following properties as physical or chemical.Turns into a silvery liquid when heated in the absence of oxygen.
Fill in the blank(s) with the appropriate word(s).
Use a diagram to illustrate how the Aggregate operation works.
What will be an ideal response?