Why is the force of gravity lower on Mercury than it is on Earth?

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GenSci 704 q2

Question	Answer
Do planets shine by their own light, or by reflected light?	reflected light
Which planet is closest to the sun?	Mercury
Venus has a dense atmosphere of _______ _______.	carbon dioxide
_____ is known as the "Red Planet."	Mars
Comets are made of _____ and _____.	ice dust
Which planets are known as the "Jovian" planets?	Jupiter Saturn Uranus Neptune
Which planets are known as "terrestrial?"	Mercury Venus Earth Mars
There is a large belt of asteroids orbiting between which two planets?	Mars and Jupiter
A planet's axis is associated with its: -rotation -revolution	rotation
A planet's orbit is associated with its: -rotation -revolution	revolution
Why is the force of gravity lower on Mercury than it is on Earth?	Because Mercury's mass is less than Earth's.
The direction of rotation of ______ is backwards (or "retrograde") to the rotation of all other planets.	Venus
The mass and gravity of the Earth are used as a ________ of comparison with other planets.	standard
The two major components of the Earth's atmosphere are ______ and _______.	nitrogen oxygen
Why is it unlikely that any living organism could survive on the Martian surface? ("Martian" means "Of Mars.")	Because of the ultraviolet radiation.
In size, Jupiter is the ________ planet in the solar system.	biggest
Galileo discovered ______ of Jupiter's sixteen satellites.	4
The rings of Saturn consist of particles of ___________.	ice
The satellites of Uranus revolve around the planet in planes almost _________ to its orbit.	perpendicular
Why was it possible to predict the location of the planet Neptune?	because of a detailed study of Uranus and how it was affected by the location of Neptune.
What is unique about Pluto's orbit around the sun? _revolves opposite to all other planets _ inclined more than other planets _ most circular orbit _ most elliptical orbit	_inclined more than other planets _most elliptical orbit
The numerous asteroids may have once been __________	a planet
Most comets travel around the ______ in elongated ______ orbits.	sun elliptical
True or false: Comets have long, indefinite life spans.	False
Put the nine planets in order from the sun outwards. Pluto Mars Uranus Venus Neptune Mercury Jupiter Saturn Earth	Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, Pluto. Remember "My very excellent mother just served us nine pizzas."

Created by: MarkmanHomeschool

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