Geoscience

5. What is left of a meteor after it strikes the ground on impact.
8. The amount of flattening of the ellipse.
9. Celestial body resembling a small planet but lacking certain technical criteria that are required for it to be classed as a planet.
11. Lighter bands in the atmosphere.
13. Meteoroid becomes this if it enters Earth’s atmosphere.
15. Solid object miles or more across.
17. Caused by streams of meteoroids entering Earth's atmosphere at extremely high speeds.
18. Mercury’s steep cliffs.

1. Darkers bands in the atmosphere.
2. Useful unit of measurement within our solar system.
3. Small body moving in the solar system that would become a meteor if it entered the Earth's atmosphere.
4. Planets that have a rocky surface like Earth.
6. Defined by two points, each called a focus, and together called foci.
7. Apparent change in the movement of the planet through the sky.
10. Element sample squeezed to pressures beyond what exists at the center of the Earth.
12. Large planet mostly composed of helium and/or hydrogen.
14. Celestial object consisting of a nucleus of ice and dust and, when near enough to the sun, forms a “tail”.
16. Region of the solar system beyond the orbit of Neptune, contains many comets, asteroids, and other small bodies made largely of ice.