What produces aurorae?
A) Chemical reactions in the upper atmosphere
B) Meteors
C) Collisions of high energy particles with atmospheric gas
D) Reflection of sunlight by high clouds
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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
Q24: What is the primary cause of the
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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