People cannot live on Mars now because some important things like air and water are __________.
MISSING
There isn’t enough __________ for people to breathe on Mars.
OXYGEN
The __________ temperature on Mars is about –60°C.
AVERAGE
Scientists want to change the __________ of Mars to make it more like Earth.
ENVIRONMENT
One goal is to make Mars warmer by increasing the __________ gases.
GREENHOUSE
Factories could be built on Mars to __________ greenhouse gases.
RELEASE
Some gases are __________ inside the ice at the poles of Mars.
TRAPPED
When it rains, people could grow __________ outside for food.
PLANTS
These plants will help add more oxygen to the __________, making life possible for humans.
ATMOSPHERE
Most scientists agree that Earth is becoming warmer due to increased _____________ of greenhouse gases in our atmosphere
LEVELS
What are scientists trying to do with Mars?
They are working on plans to turn Mars into a new Earth. (Paragraph A)
What three basic things do humans need to live?
Water, air, and food. (Paragraph B)
Why can’t humans live on Mars right now?
Because there isn’t enough oxygen and no liquid water. (Paragraph
What is the process called that can make Mars habitable?
Terraforming. (Paragraph B)
What does terraforming mean?
Changing the environment of a planet so it is similar to Earth’s. (Paragraph C)
What is the average temperature on Mars?
About minus 60 degrees Celsius. (Paragraph C)
