Science+Pretest

Angela Corrao Science practice test

1. **Rotation-** The spinning motion of a body on its axis
 * Revolution- ** The elliptical motion of a body as it orbits another body in space

2. **Ellipse-** An event in which the shadow of one celestial body falls on another Circle- A closed plane curve consisting of all points at a given distance from a point within it called the center. Equation: x 2 + y 2 = r 2.

3. **Solar system-** The system composed of the sun 9a star) and the planets and other bodies that travel around the sun
 * Solar nebula- ** The nebula that formed into the solar system

4. **Planetesimal-** The tiny building blocks of the planets that formed as dust particles stuck together and grew in size = Planet- A similar body revolving about a star other than the sun. = 5. **Temperature-** A measure of how hot something is = Pressure- The exertion of force upon a surface by an object, fluid, etc., in contact with i = 6. **Photosphere-** The layer of the sun at which point the gases get thick enough to see; the surface of the sun
 * Corona- ** The sun’s other atmosphere, which can extend outward a distance equal to 10-12 times the diameter of the sun

7. It takes millions of years for light energy to travel through the suns **radiative zone**.

8. **Rotation** of the Earth causes night and day.

9. Convection in Earth’s mantle causes **nuclear fusion.**

10. D.

11. A.

12. A.

13. C.

14. B.

15. A.

16. A.

17. A.

18. Becuase the pressure and griacity are in balence and when two nubulas crash into each other the balence is off.