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Why is Earth special?
plants are needed to pprduce oxygen that animals need to liv
It has liquid water, that plants need to produce oxygen
all of these
Ozone layer absorbs/reflects harmful EM radiation
What makes up the solar system?
It is collection of large and small bodies that orbit the sun or a central star.
What is a planet?
It is a spherical body that orbits the sun.
In our solar system, the first four planets are called?
Terrestrial planets
In our solar system, the four farthest planets from the sun are called
Gas giants
What other celestial bodies are in our solar system, besides planets and the sun?
moons, dwarf planets (Pluto), comets, asteroids, meteroids
Describe a gas giant.
Large planets that have a thick, gaseous atmoshpere with small rocky cores.
Describe terrestrial planets.
Terrestrial planets are all rocky, dense, and relatively small.
Why is Earth special?
It has liquid water, for the water cycle
the water cycle creates clouds for rain/snow
all of these
Earth's atmosphere has gases animals need to live
What is a star?
It is a large celestial body that emits light and is composed of gases.
What gases are stars composed of?
helium and hydrogen
In which way do stars vary from each other?
temperature
size
compostion
all of these
Where is energy converted from matter to energy in a star?
the core
What galaxy does Earth belong to?
The Milky Way
What is a galaxy?
It is large collection of stars, gas and dust that is held together by gravity.
What is a light-year?
It is the distance light travels in a year. It is used to measure vast differences.
