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Chapter 3: Section 1: The Nine Planets

Teacher: Mr. Anderson
Formed at just the right distance from the sun; liquid water key to development of life
Earth's twin (in size, mass, and density); sun rises in the west and sets in the east because of retrograde rotation; densest of terrestrial planets; Greenhouse effect causes high surface temperatures
Gas giants; no known solid surfaces; atmospheres blend smoothly into the denser layers of their interiors
Counterclockwise spin of a planet or moon as seen from above the planet's north pole
Clockwise revolution of a satellite around a planet as seen from above the north pole of the planet
Mercury; Venus; Earth; Mars
Closest to the sun; spins on axis slower than Earth
Still forming; 2nd largest planet in solar system; largest rings made of ice
Discovered by Herschel in 1781; featureless blue-green disk; tipped over on its side
Farthest planet from the sun and the smallest; moon is more than half the size of the planet; made of rock and ice
Small, dense, rocky planets of the inner solar system
Jupiter; Saturn; Uranus; Neptune; Pluto
Average distance between the earth and the sun, or approximately 150,000,000 km
Large gaseous planers of the outer solar system
The Red Planet; waater existed there in the past; volcanic history
Discovered in 1868 because of irregularities in the orbit of Uranus; Blue belts of clouds; great Dark Spot; set of 2 very narrow rings
Closer together; size; materials of which they are made
Like the sun, it is primarily hydrogen & helium; Great Red Spot; radiates more energy into space than it receives from the sun