Suppose we had a device that allowed us to see Earth's interior. If we looked at a typical region of the mantle, what would we see happening?
A) Not much: on human time scales, the mantle looks like solid rock.
B) hot molten rock rising upward throughout the mantle and cool, solid rock falling downward
C) a rapid, up and down churning of the material in the mantle
D) dense metals falling downward and low-density rock rising upward
A) Not much: on human time scales, the mantle looks like solid rock.
You might also like to view...
What are two advantages of large scopes over smaller ones?
A) Large scopes have a larger field of view and sharper focus. B) Large scopes are not subject to atmospheric turbulence and opacity like smaller ones. C) Large scopes are easier to mount and control than small ones. D) Large telescope have more light grasp and better resolution. E) Large telescopes give higher magnification and are easier to build.
What mode of fracture is present for a smooth tensile specimen when a small amount of plastic strain creates a crack that is of sufficient length to cause fracture?
(a) Mode I (b) Mode II (c) Mode III (d) Ductile
Identify a true statement about main-sequence stars
A) They balance their gravity by fusing hydrogen. B) They generate energy by breaking uranium isotopes. C) They do not increase in size as they consume their fuel. D) They do not undergo any molecular change during their life spans.
Normal galaxies in the present never went through an active galaxy phase
a. True b. False Indicate whether the statement is true or false