One observation that suggests that the Earth has a dense central core is that
A) the Earth has plate tectonics
B) surface rocks have the same density as the overall density of the planet
C) surface rocks have a lower density than overall density of the planet
D) surface rocks have a higher density than the overall density of the planet
C
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A bowling ball exerts a force on the pins when it strikes them, knocking them down. The force of the pins on the ball is ________.
A. larger than the force of the ball on the pins B. less than the force of the ball on the pins C. the same as the force of the ball on the pins D. either less or more, depending on how hard the ball is thrown E. A system of ten bowling pins is too complicated to know the force on the ball.
When charges qa, qb, and qc are placed respectively at the corners a, b, and c of a right triangle, the potential at the midpoint of the hypotenuse is 20 V. When the charge qa is removed, the potential at the midpoint becomes 15 V. When, instead, the charge qb is removed (qa and qc both in place), the potential at the midpoint becomes 13 V. What is the potential at the midpoint if both charges qa
and qc are removed? a. 13 V c. 5 V b. 7 V d. 8 V
Going from oldest to youngest, the three periods of the Mesozoic are
A) Triassic, Jurassic, and Permian. B) Jurassic, Triassic, and Cretaceous. C) Triassic, Jurassic, and Cretaceous. D) Cretaceous, Permian, and Jurassic.
What are the three main atmospheric lifting mechanisms?
What will be an ideal response?