What is the primary cause of the Earth's magnetic field?
A) Currents in the Earth's core
B) Permanent magnetism left over from the formation of the Earth
C) The flow of ionized gases in the Earth's upper atmosphere
D) Pockets of solar magnetism captured from the solar wind
Correct Answer:
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Q18: Plate tectonic is believed to be caused
Q19: The layer of plastic,deformable rock just beneath
Q20: What are the two most abundant gases
Q21: What is the primary reason that aurorae
Q22: The Earth's magnetopause is
A)The outer boundary of
Q23: What produces aurorae?
A)Chemical reactions in the upper
Q25: The Earth's mantle is in what state?
A)solid
B)liquid
C)gas
D)plasma
Q26: In the plate tectonic model of the
Q27: Aurorae are produced when the Earth's atmosphere
Q28: The Earth's inner core is in what
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