The cores of the terrestrial worlds are made mostly of metal because ________
A) the terrestrial worlds as a whole are made mostly of metal
B) metals sunk to the centers a long time ago when the interiors were molten throughout
C) over billions of years, convection gradually brought dense metals downward to the core
D) the core contained lots of radioactive elements that decayed into metals
B
You might also like to view...
Graphical Analysis: An object is moving with constant non-zero velocity in the +x direction. The position versus time graph of this object is
A. a horizontal straight line. B. a vertical straight line. C. a straight line making an angle with the time axis. D. a parabolic curve.
A 6.1-kg solid sphere, made of metal whose density is 2600 kg/ , is suspended by a cord. When the sphere is immersed in a liquid of unknown density, the tension in the cord is 26 N. Find the density of the liquid
A) 1500 kg/ B) 1400 kg/ C) 1300 kg/ D) 1200 kg/ E) 1100 kg/
The force of Earth's gravity on a capsule in space increases as it comes closer. When the capsule moves to half its distance, the force toward Earth is then
A) twice. B) three times greater. C) four times greater. D) none of the above
In order for a satellite to be geosynchronous, its orbit must:
a. go over the North and South Poles. b. be over the equator. c. be over a single longitude. d. emit television signals.