History, Weathering And Erosion Unit TEst Question Preview (ID: 49751)


Unit 2 Test On Geologic History, Weathering And Erosion. TEACHERS: click here for quick copy question ID numbers.

1. How does a texture of a rock surface affect how fast it can be physically weathered by water?
a) a. Rocks with smoother surfaces erode faster than rougher rocks.
b) b. Rocks with cracks and fractures are more susceptible to frost wedging, salt wedging, and biological weathering.
c) c. Rocks at the bottom of a lake will weather faster than rocks at the bottom of a river.
d) d. Rocks with bumpy surfaces are more susceptible to frost wedging, salt wedging, and biological weathering than rocks with c

2. Why do scientists know very little about life in the Precambrian eon?
a) a. The eon started with a mass extinction.
b) b. There was no life on Earth during that Eon.
c) c. There are few fossils from that time.
d) d. It was just too long ago.

3. What evidence is there that oxygen levels in the sea increased due to photosynthetic bacteria?
a) a. Rust deposits in the ancient ocean.
b) b. Rust deposits in today’s oceans.
c) c. Decreases in anaerobic organisms.
d) d. Oxygen levels found in polar ice caps

4. What provides evidence of an increase in animal species at the same time that atmospheric oxygen concentrations increased?
a) a. Stromatolites
b) b. Fossil record
c) c. Ice cores
d) d. Rust deposits

5. The Rocky Mountains began forming in the western United States about 60 million years ago. The Appalachian Mountains and the Rocky Mountains were similar in height when they first formed. Which statement about the Rocky Mountains are true?
a) a. They are shorter than the Appalachian Mountains.
b) b. They are younger than the Appalachian Mountains.
c) c. They are older than the Appalachian Mountains.
d) d. They erode at a slower rate because of the climate.

6. Which of the following are ways that humans can help protect coral reefs and prevent erosions to coastlines?
a) a. Reduce fossil fuel use
b) b. Reduce water use
c) c. Build more groins, jetties, and sea walls.
d) d. Reduce food consumption

7. Which best describes the physical weathering of a rock by water?
a) a. Water carries away pieces of a rock.
b) b. Water breaks down a rock into smaller pieces with the same composition as the larger rock.
c) c. Water dissolves rock into a solution.
d) d. Water seeps into a rock and leaves behind mineral crystals.

8. Which describes the Grand Canyon as it will be one million years from today?
a) a. It will become narrower, as weathered rock collects at the canyon’s edges.
b) b. It will become wider as sediment being transported will further erode the canyon walls.
c) c. It will become shallower, as the Colorado River deposits sediment in the canyon.
d) d. It will become deeper, as the Colorado River continues to carve into the rock.

9. Which fact can you say is certain only by reading the geologic time scale?
a) a. How old the Earth is.
b) b. The life forms that lived in each era.
c) c. The events that ended major divisions of geologic time.
d) d. When the earth will likely experience another extinction level event.

10. Which form of chemical weathering most efficiently erodes limestone?
a) a. Dissolution
b) b. Hydrolysis
c) c. Carbonation
d) d. Oxidation

Which of the following events happened SECOND in the development of Plants
a) Bryophytes became the first land plants.
b) Plants evolve to have vascular tissue to transport water.
c) Cyanobacteria begin to photosynthesize.
d) Cyanobacteria became the chloroplast of plants.

12. What term describes physical weathering due to collisions between sand and sediment carried in moving water and the rock surface over which the water flows?
a) a. Dissolving
b) b. Salt Wedging
c) c. Erosion
d) d. Abrasion

13. What is an example of a physical weathering?
a) a. A metal tool left outside beginning to rust.
b) b. Microscopic organisms producing compounds that break down a rock.
c) c. Bits being blown off a rock by heavy winds.
d) d. Insects burrowing a hole into a rock.

14. Which process is an important part of chemical weathering through oxidation?
a) a. Oxygen giving up electrons to other elements.
b) b. Oxygen giving up protons to other elements.
c) c. Oxygen capturing electrons from other elements.
d) d. Oxygen capturing neutrons from other elements.

15. In a small bay that contains a coral reef, the water temperature has remained the same for decades. Recently, scientists discovered that the water temperature in the bay has increased by 1°C. Which is most likely to happen?
a) a. The coral reef will undergo a period of intense growth.
b) b. The coral reef will immediately die.
c) c. The coral reef will experience a bleaching event.
d) d. Nothing

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