Seafloor spreading on the Earth is the process by which
A) volcanic material flows from the deep interior to produce volcanic islands
B) dense material sank while lighter material rose to the surface during the early geological history
C) molten lava oozes out between two tectonic plates that are slowly moving apart
D) oceanic crust sinks below continental crust at a tectonic plate boundary
C
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Neutron stars are expected to spin rapidly because
a. they conserved angular momentum when they collapsed. b. they have high orbital velocities. c. they have high densities. d. they have high temperatures. e. the energy from the supernova explosion that formed them made them spin faster.
Each of two vectors, 
and 
, lies along a coordinate axis in the xy plane. Each vector has its tail at the origin, and the dot product of the two vectors is 
data-wiris-created="true" class="Wirisformula" />. Which possibility is correct? A.
and both lie along the positive x axis.B.
lies along the positive x axis. lies along the negative x axis.C.
and both lie along the positive y axis.D.
lies along the negative x axis. lies along the negative y axis.E.
lies along the positive y axis. lies along the negative y axis.What is 34 + ( 3 ) × (1.2465 ) written with the correct number of significant figures?
A) 37.7 B) 37.74 C) 4 × 101 D) 38 E) 37.7395
If we double the mass of an object without a change in volume, its density would be
A) half. B) double. C) unchanged.