Answers created by Thomas S.

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• Question #f8ee9
  
• What kinds of rocks can undergo metamorphism?
  
• Which igneous rock is dark colored, cooled rapidly on Earth's surface, and is composed mainly of plagioclase feldspar, olivine, and pyroxene?
  
• Is the potential difference between the terminals of a cell in a circuit fixed, or does it depend on the components that are connected in the circuit?
  
• How do you find the slope and intercept of `y=2/3(2x-4)`?
  
• What is the length of the hypotenuse of a right triangle if the two other sides are of lengths 8 and 7?
  
• The square of the sum of two consecutive integers is 1681. What are the integers?
  
• What are trilobites?
  
• What is the name for the covalent compound whose chemical formula is `H_2S`?
  
• How many electrons must be shown in the Lewis structure of the hydroxide ion, `OH^-`?
  
• What are physical properties of acids?
  
• Question #a1b8f
  
• What causes the characteristic crystal shape and cleavage (breaking along flat surfaces) of the mineral halite?
  
• What is the difference between the study of astronomy and the study of cosmology?
  
• What is a mafic mineral?
  
• How does the earth's core generate heat?
  
• A student does 100 J of work on the handle of a bicycle pump. The pump does 40 J of work pushing the air into the tire. What is the efficiency of the pump?
  
• What is an electrical load, and what are some examples of electrical loads?
  
• What property of metals allows a jeweler to hammer a piece of silver to make jewelry?
  
• How does silica affect the color of igneous rocks?
  
• Can you list major layers of Earth's interna| structure based on physical properties? What are the layers in order from Earth's center to the surface?
  
• How fast will an object with a mass of `15 kg` accelerate if a force of `48 N` is constantly applied to it?
  
• If the length of a `29 cm` spring increases to `63 cm` when a `15 kg` weight is hanging from it, what is the spring's constant?
  
• How do we know that the continents were formed during the Precambrian?
  
• What is the gravitational potential energy of a `7 kg` object on a shelf `2/5 m` high?
  
• What is hematite made of?
  
• What sedimentary rock is made of fragments of rock with jagged edges?
  
• During which division of geologic time did the most recent ice age occur?