Earth: the Third Planet

Questions

1. Details How long is one year on Earth?

   about 165 Earth years 225 Earth days 687 Earth days 365 days
2. Details What is Earth known for?

   wide, bright rings a surface covered in craters liquid water on its surface a tilt that makes it spin on its side
3. Cause and effect Why does Earth have liquid water on its surface?

   Scientists think a huge object crashed into it long ago and knocked it over. Winds on Jupiter are so strong that one storm has lasted for hundreds of years. The rings are made of billions of pieces of ice and rock circling the planet. It is the right distance from the Sun for water to stay liquid, not frozen or boiled away.
4. Vocabulary What does "orbit" mean in the passage?

   the path a planet takes around the Sun a bowl-shaped hole made when a space rock hits a surface a large planet made mostly of icy materials like water, ammonia and methane an opening in a planet's surface where melted rock comes out
5. Details Where is Earth in order from the Sun?

   the fifth planet the first planet the sixth planet the third planet
6. Main idea What is this passage mostly about?

   what the planet Earth is like what the planet Mars is like how rockets are built what the planet Mercury is like
7. Inference Based on the passage, why is a year on Earth shorter than a year on Earth?

   It spins faster. It has more clouds. It is farther from the Sun, so its orbit is longer. It is closer to the Sun, so its orbit is shorter.
8. Evidence Which sentence best explains why Earth has liquid water on its surface?

   Earth is the only planet known to have life. It is the right distance from the Sun for water to stay liquid, not frozen or boiled away. One year on Earth, the time it takes to travel once around the Sun, lasts 365 days. The temperature on Earth is about 15 degrees Celsius on average.

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