Geology - Earth Sciences Essay

520 Words 3 Pages
Geology - Earth Sciences


1. What is the commonly accepted age of Earth?
a) 4.6 Billion years
2. Which of the following was not a source of heat for the early Earth?
a) hydrothermal energy
3. What are small asteroids called?
a) meteoroids
4. What is the process by which a planet becomes internally zoned when heavy materials toward its center and lighter materials accumulate near its surface?
a) Diffentiation
5. Where is most of the North American Precambrian shield exposed at the surface?
a) Canada
6. What mineral can be used to radio metrically date Earth’s age?
a) zircon
7. Refer to Figure 22-6. What name is given to the core of the modern-day North American continent that formed in the
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crust weathered
13) Explain how geologists have determined the age of Earth?
a) Radio metric dating has determined that the ziron grans in the sedimentary rocks are between 4.1 and 4.2 billion years old.
14) Discuss the relationships among the formation of the continents, the atmosphere and the oceans.
a) The relationship between the formation of the continents, the atmosphere and the oceans is the most abundant gases of the Earth’s crust. They play two huge roles in all 3 of these formations.
15) What geologic evidence suggests that free oxygen was accumulating in Earth’s atmosphere during the Proterozoic?
a) These formations are mined 20 a source of iron and can be mined for a profit.
16) What geologic evidence suggests that free oxygen was accumulating in Earth’s atmosphere during the Proterozoic?
A) The existence of red beds
17) What is the difference between prokaryotes and eukatyotes? Which appeared first in the fossil record?
a) Prokaryotes is an organism that is composed of a single cell and a eukayote is an organism that is composed of cells that contain a nucleus, prokaryotes.
18) What characteristics of continental crust allow it to “float” higher on the mantle than oceanic crust?
a) less dense material had the tendency to float on more dense material
19) Why are orogens deformed?
a) The immune energy of colliding continents deformed these origins.
20) What is the significance of the Edicara fauna?
a) The Ediacara fauna were thought to be the ancestors of…

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