Earth and Space (all topics revision)

Question	Answer
Day and Night happen because...	Rotation of the Earth on its own axis
Seasons happen because...	1. Earth's Tilt (23.5 degrees) 2. The Earth's orbit around the sun (365.25 days)
Summer	The hemisphere which receives the most light, heat and energy from the sun. Places at the equator do not have seasons
Winter	The hemisphere which receives the least light, heat and energy from the sun. Places at the equator do not have seasons
Lunar Month	28 days
Solar Eclipse	When the moon is between the sun and the Earth. This will create a shadow on part of the Earth.
Lunar Eclipse	When the moon is behind the Earth (in its shadow) so the moon will appear very dark
8 phases of the moon	1. New moon 2. Waxing Crescent 3. First Quarter 4. Waxing Gibbous 5. Full Moon 6. Waning Gibbous 7.Last Quarter 8. Waning Crescent Image: phases (image/jpg)
Planets of our Solar System according to distance from the sun and time to orbit the sun	Mercury Venus Earth Mars Jupiter Saturn Uranus Neptune
Inner and Rocky Planets	Mercury Venus Earth Mars
Outer and Gaseous Planets	Jupiter Saturn Uranus Neptune
Gravitational force increases	when distance decreases when the masses increase
Gravitational force decreases	when distance increases when the masses decreases
Weight is	W=mg
Weight is measured in	Newtons
Mass is ...	not the same as weight. Mass is the amount of matter present in an object
Satellites can be...	artificial or natural
Example of natural satellite	The moon
A satellite is...	an object orbiting a larger object in space
Different uses for satellites:	1. Earth observation (map making and imaging) 2.Weather forecasting 3. Communication 4. Defence 5. Space observation 6.manned satellites and space stations
To escape Earth's gravity...	An object has to move with what is known as the escape velocity
Light year	The distance light travels in a vacuum in 1 year

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Earth and Space (all topics revision)

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	Created by Karen Bugeja about 10 years ago