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Science: Chapter 20
| Question | Answer |
|---|---|
| What is a nebula? | cloud of gas & dust |
| Name the 4 characteristics (elements) that it akes to make a solar system | hydrogen, helium, carbon, iron |
| What holds matter together? | gravity |
| What do high temperatures cause? | collisions |
| What do collisions build? | pressure |
| What does the balance between pressure and gravity prevent? | The pressure prevents collapse. |
| What happens when two nebulas collide? | A near by star explodes. |
| What is a globule? | a compressed areas of a nebula |
| How long did it take the solar system to form? | 10 million years |
| What is a planetesimal? | They are objects that range from small sized bodies to the core of current planets |
| Are outer planets mostly gas or mostly rock? | Mostly gas |
| Are inner planets mostly gas or mostly rock? | Mostly rock |
| What do happens to hydrogen and helium when temperature and pressure are increased? | Hydrogen and Helium fuse causing nuclear fusion and a star is born |
| Is the sun solid? | No, the sun in not solid |
| What is the sun's outer atmosphere called? | corona |
| What is the name of the thin layer directly below the corona? | chromosphere |
| What is the name of the visible part of the Sun from the Earth? | Photoshere |
| What is the name of region about 200,000 kim think where gasses circulate? | Connective Zone |
| What is the name of the dense region that is about 300,000 km thick? | Radiative zone |
| What is the name for the center of the sun? | Core |
| What layer does the sun produce it's energy? | Core |
| How long has the sun been shining? | 4.6 billion years |
| What is nuclear fusion? | When nuclei of atoms form larger nucleus to release energy |
| What does the sun get energy from? | Nuclear fusion |
| How long does it take the energy made at the sun's core to reach the surface? | Millions of years |
| What is a sunspot? | a cool, dark spot on the sun |
| How long does a sunspot cycle last? | 11 years |
| What is a solar flare? | A region of high temperature and brightness on the sun. It sends electricity into the solar system |
| What is a rotation? | the spin on an axis |
| What is a orbit? | The path a planet follows around another body in space |
| What is a revolution? | A complete trip around an orbit. |
| How long does it take the Earth to complete an orbit? | 365.25 days |
| The sun moves in an elongated circle called a? | an ellipse |
| What is an ellipse? |
Created by:
Kedman
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