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Inner and Outer Planets

Use your book to answer the questions. Highlight the sentences in your book that help you find your answers. 
Across
Because the four outer planets are so large, they are often called ____ _______.
All the inner planets have an atmosphere except ______.
Temperatures ________ tremendously from the outer to inner layers of the gas giants.
Mars’s atmosphere is composed mostly of ______ ________.
A few scientists believe that Saturn’s largest moon, _____, may support life.
Space probes such as _______ have revealed many details of the outer planets.
The inner planets are small and dense and have ________ surfaces.
The thick clouds on Venus are made up mostly of _______ acid droplets.
Uranus’s axis is tilted at an angle of about _____ degrees from the vertical.
Space _______ have given scientists important information about Mercury, Venus, and Mars.
Earth is unique in our solar system for having liquid ______ on its surface.
Down
All the outer planets have many ___, which range in number from 13 to greater than 60.
______ rotates so slowly that its day is longer than its year.
The inner planets that experience a ________ effect are Venus and Earth.
All the gas giants’ atmospheres are made up primarily of helium and ______.
Some regions of Mars have giant _______.
Uranus is _____ as far from the sun as Saturn, so it is much colder.
Neptune’s _____ color comes from methane in its atmosphere.
A(n) _____ is a thin disk of small particles of ice and rock.
Oxygen makes up about ______ percent of Earth’s atmosphere.