54. What do geologist study?

61. Why is the inner layer of the Earth solid?

63. How old is the Earth?

65. What does the law of superposition state?

71. Which test is more reliable when identifying a mineral: streak test or color test? Why?

72. Who came up with the theory of plate tectonics?

68. What process turns rocks into sediment?

69. How is an igneous rock formed?

59. What are the two types of crust?

62. Scientists study the internal structure of the earth by recording and observing earthquakes. What is traveling through the earth that allows scientists to study its structure?

67. What generally signals the end of an era?

73. It is hypothesized that all continents were once joined together in a supercontinent. What was it called?

75. Where does old crust get recycled back into the Earth?

75. Where does new crust get created?

77. Where does sea floor spreading occur?

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