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Explanation:  

1. Interstellar Medium

2. around 13 billion years

3.telescope

4.  the inner planets have low gravity and cannot attract rocks to their atmosphere.

5.  oceans, groundwater, freshwater.

6.   Solar Nebula, Circumstellar Disks, Planetesimals, Terrestrial Planets (Inner

Solar System), Gas Giants (Outer Solar System)

7. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

8. its a circular loop  around the sun.

9. The carbon dioxide traps most of the heat from the Sun.

10. saturn

11. molten heavy-metal core, few moons and topological features such as valleys, volcanoes and craters.

12.  no solid surfaces and are essentially large balls of gas composed primarily of hydrogen and helium.

13. eight

14. , new moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter and waning crescent

15. the Moon has phases because it orbits Earth, which causes the portion we see illuminated to change.

16. the earth

17.total lunar

18.Waxing Gibbous Moon.

19. synchronous rotation.

20.Turbulent Beginnings.

21. closest: perigee farthest: apogee

22.the Moon is lined up between the Earth and the Sun. We see the side of the Moon that is not being lit by the Sun

23. where its facing

25.  Lithosphere, Asthenosphere, Mesosphere, Outer Core, and Inner Core. (put these down starting with inncer core to lithosphere.)

26. metal—specifically, iron and nickel

27.Earth is the only planet in the solar system with an atmosphere that can sustain life.

28. Continental crust

29. mantle

30. temperatures increase exponentially.

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the relative atomic mass of an element is the mass of one atom of that element, relative to 1/12th of the mass of a  1212c atom. to convert to an absolute mass in kg, it is necessary to multiply by  1.661×10−271.661×10−27.

the relative atomic mass is roughly equal to the number of neutrons, plus the number of protons, in the nucleus of the atom.

for elements with more than one stable isotope (different types of nucleus with different numbers of neutrons but the same number of protons), the quoted mass is usually the average mass, weighted by the relative abundance of the different isotopes.