Two pairs of sunspots appear similar, but if one photo was made in 1990, and the next photo was made in 2002, what difference would we note?
What will be an ideal response?
In the 12 years, the magnetic field polarities will have reversed.
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A.A B.B C.C D.D E. Toward the viewer F. Away from the viewer T. The field is zero.
When does hydrogen first begin to fuse into helium in the star formation process?
A) when the cloud first begins to contract B) when the thermal pressure is trapped at the center of the cloud C) when the protostars undergoes convective contraction D) when the protostar undergoes radiative contraction E) only when the star reaches the main-sequence
Two ice skaters push off against one another starting from a stationary position. The 45.0-kg skater acquires a speed of 0.375 m/s
What speed does the 60.0-kg skater acquire? Assume that any other unbalanced forces during the collision are negligible. A) 0.281 m/s B) 0.000 m/s C) 0.750 m/s D) 0.500 m/s E) 0.375 m/s
The theory of continental drift is supported by paleoclimatic data, the jig-saw fit of the continents
A) paleontology, and paleomagnetic data. B) and seafloor spreading. C) transform boundaries, and paleontology. D) at their continental margins, and paleontology.