Page 141-142 Flashcards
Early astronomers believed that the sun the moon and the stars revolved around___
Earth
Large bodies that orbit a star are ___
Planets
The sun and all of the planets moons and other bodies that travel around it make up the___
Solar system
The closest planet to the sun is ___
Mercury
Mercuries density is about the same as _____ density
Earths
Venus rotates in a direction ____ that of earths rotation
Opposite
A day on Venus is longer than its___
Year
Temperatures on Venus are very high due to a strong____
Green house effect
Earth is the ___ planet from the sun
Third
Earth is the only planet in the solar system known to _____
Support life
Areas around earth where particles from the sun are trapped are called_____
Van Allen radiation belts
Earth is protected from small degrees from space by the ____
Atmosphere
The rotation period of Mars is almost the same as___
Earth
Since Mars’s axis is tilted the planet has___
Seasons
Mountains can build higher on Mars than on earth because it’s ___ is less than earths
Gravity
Earth has an atmosphere made up of nitrogen and ____
Oxygen
Green plants and other producers release oxygen into the atmosphere as part of _____
Photosynthesis
The part of the atmosphere closest to earths surface is the ____
Troposphere
Rocky metallic objects that orbit the sun are ____
Asteroids
Asteroids are found mostly in a belt between the orbits of ____ and Jupiter
Mars
Some_____ have orbits that cross earths path
Asteroids
