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Answer Key
Grade 4 Reading — Science & Space
1.
reflected sunlight (the Moon does not make its own light)
2.
the side facing Earth is in shadow, so the Moon seems to vanish
3.
about twenty-nine days
4.
a simple calendar / sketching the Moon on clear nights
5.
planning work for sailors and farmers (accept naming full moons after seasons)
6.
iron-rich dust gives the surface a rusty color
7.
collect soil and rock samples (accept analyze minerals)
8.
radio signals take many minutes to travel between Earth and Mars
9.
dried riverbeds / layered rocks formed in water / methane readings (any one)
10.
it improves technology such as medical devices or astronaut safety tools
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