Allison Thompson Midterm

1. Have we ever witnessed a major impact?
1. A) The most recent major impact happened in 1994, when fragments of comet SL9 hit Jupiter
2.  Why are Jupiter's Galilean moons geologically active?
1.  B) Tidal heating drives activity, leading to Io's volcanoes and ice geology on other moons
3.  What geological processes shape Earth's surface? 
1.  C) Impact cratering, volcanism, tectonics, and erosion
4.  What theory best explains the features of our solar system?
1. D) The nebular theory, which holds that our solar system formed from a cloud of interstellar gas, explains the general features of our solar system
5.  Where did asteroids and comets come from?
1.  A) They are leftover planetesimals, according to the nebular theory 
6.  What is matter?
1.  B) Ordinary matter is made of atoms, which are made of protons, neutrons, and electrons
7. What are the three basic types of spectra?
1.  C) Continuous spectrum, emission line spectrum, and absorption line spectrum
8.  What keeps a planet rotating and orbiting the Sun?
1.  a) The mass of the Sun
9.  Write down Newton's formula for the force of gravity.
1.  

 10.How did astronomical observations benefit ancient societies?
                1.  B) Keeping track of time and seasons; navigation