What was the key physical property in determining the two categories of planets during solar system formation?
a. pressure
b. gravity
c. density
d. momentum
e. temperature
e
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Acceleration: If the velocity of an object is zero, then that object cannot be accelerating.
A. True B. False
An airplane is flying with constant speed along a horizontal circle. Is the direction of its acceleration constant?
What will be an ideal response?
The Earth's magnetic field is attributed to the
A) flow of molten liquid in Earth's inner core. B) flow of molten fluid in Earth's outer core. C) movement of lithospheric plates in the outer mantle. D) movement of lithospheric plates at Earth's surface.
What happened during the heavy bombardment?
A) The planets of the solar system suffered many impacts. B) The planets collided with one another. C) Planetesimals collided with one another and stuck together to form planets. D) A supernova disrupted a gas cloud, causing it to start collapsing to form the solar system. E) A large meteor collided with Earth, killing the dinosaurs.