A mid-ocean ridge is formed at the boundary of two plates
a. that are separating from one another.
b. that are sliding horizontally past one another.
c. where one is pushing over the top of the other.
d. that are basically at rest.
a
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How does the unified model of AGN explain blazars?
a. Blazars are Seyferts galaxies seen edge on. b. Blazars are regions of the intergalactic medium where gas has been heated by a nearby AGN. c. Blazars are relativistic jets from an AGN pointed toward our light of sight. d. Blazars are newly formed AGN from a recently galactic collision.
Velocity Addition: A spaceship, traveling at 0.560c towards a stationary space platform, launches a secondary towards the station with a speed of 0.100c relative to the spaceship. What is the speed of the secondary rocket relative to the space platform?
A. 0.460c B. 0.575c C. 0.600c D. 0.625c E. 0.660c
The determination of the composition of a material by bombarding it with neutrons and monitoring the emitted radiation is neutron activation analysis
Indicate whether the statement is true or false
The principal greenhouse gases in our present atmosphere are:
A) hydrogen and helium. B) hydrogen sulfide and carbon disulfide. C) water vapor and carbon dioxide. D) methane and ammonia. E) sulfuric acid vapor and carbon dioxide.