1) Earth is surrounded by a bubble of air called _______. a) atmosphere b) outer space 2) Earth _______ causing day and night. a) dusk b) rotates 3) A _______ circles around a star. a) meteors b) planet 4) Earth rotates on its axis and _______ around the Sun. a) orbits b) gravity 5) Astronomers use these tools to look closer at objects in space. a) telescopes b) constellations 6) Earth rotates __________. a) clockwise b) counterclockwise 7) People from _______ times believed the stars had been placed in the sky by gods. a) ancient b) modern

Knowledge Unit 6 PP

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