WorksheetsCLMS Unit 6B Test Review
Total questions: 20
Worksheet time: 10mins
What is found in Antarctic because it used to be located at a tropical latitude?
sharks
coal beds
palm trees
sand
The graph shows possible changes to sea level over geologic time. What did scientists MOST likely study to construct this graph?
molten magma
extrusive igneous rocks
sedimentary layers
foliated metamorphic rocks
Which point indicates the oldest exposed layer?
1
2
3
4
Imprints of the shells of ocean clams are often found in the rocks of the Appalachian Plateau provinces. What do these imprint fossils MOST likely indicate?
Someone took clams to the mountains
The clams migrated to the mountains
The fossils are in a museum in the mountains
The mountains were once covered by ocean water
Which formation in this geological map is youngest?
1
2
3
4
The incompleteness of the fossil record results primarily from which phenomenon?
the frequency and irregular timing of organism speciations
the metamorphism of most sedimentary rock by heat and pressure
the geologically rapid cycling of crust material back into the mantle
the rarity with which organic remains are exposed to fossil-forming conditions
A student is visiting a local limestone quarry and finds fossils of seashells. The quarry is located hundreds of miles from the ocean. The fossils BEST indicate that
this area was once below sea level
global temperatures changed over time
erosion rook place after a flood
volcanic activity affected the area
Why would a geologist use the law of superposition and index fossils to date a rock formation when radiometric dating is available?
Calculating ages using index fossils confirms evolutionary sequences
Radiometric dating is inaccurate when used on sedimentary rocks
Radiometric and fossil dating are only effective on organic matter
The law of superposition gives the most specific dating information
Which of the following BEST describes the fossil at Point 3 when compared with the fossils at Points 1 and 2?
The fossil at Point 3 is less common
The fossil at Point 3 is smaller
The fossil at Point 3 is older
The fossil at Point 3 is more complex
The half-life of a radioactive element, such as carbon-14, is the time it takes for half of the atoms of the element to decay. How many half-life periods have passed if a fossil contains 1/32 of the original amount of carbon-14?
3
4
5
6
What percentage of carbon-14 will remain after 4 half-lives of time has passed?
12.5%
25%
6.25%
3.125%
Radiocarbon dating is used to determine the age of many artifacts. Select all of the objects that could be dated by radiocarbon dating techniques.
bronze spear point from Early Greece
ancient human bone found at a burial site
piece of cloth that wrapped an Egyptian mummy
stone from a Neolithic henge monument in Europe
When two fish die, Fish A sinks to the bottom of a lake and Fish B washes up on the rocky lake shore. Why is a fossil more likely to form from the body of Fish A than from the body of Fish B?
Soft parts of the fish will decay more quickly in the water
Sediments in the water will quickly cover the fish
Scavengers in the water will eat the remains of the fish
Currents in the water will move the fish
Which environmental condition MOST likely existed at the time a fossil formed?
Organism remains were deposited in an area of open space
Organism remains were covered by lava flow
Organism remains were buried with little oxygen
Organism remains were buried in an area where a lot of erosion occurred
Iron-rich deposits that formed about 2 billion years ago have red layers. Layers formed before then were not red. The red layers formed when oxygen made during photosynthesis reacted with iron molecules in the ocean. The oxidized iron formed layers of sedimentary rock. Which BEST summarized this phenomenon?
The biosphere changed the lithosphere
The lithosphere changed the atmosphere
The hydrosphere changed the atmosphere
The atmosphere changed the biosphere
Studies of Venus indicate what can happen if the atmosphere of a planet contains a high % of CO2. The development of photosynthetic live removed much of the CO2 from the atmosphere of Earth. This process released oxygen, which then bonded with iron on the surface to form red beds. Compared to current conditions, what can be inferred about what Earth was like before the formation of the red beds?
Earth was warmer
Earth was cooler
Earth was more dense
Earth was less dense
If cyanobacteria had failed to appear on Earth, how would the evolution of Earth's atmosphere most likely be different?
Earth's atmosphere would lack significant amounts of nitrogen
Earth's atmosphere would consist of volcanic gases and water vapor
Earth's atmosphere would contain more oxygen and less CO2
Earth's atmosphere would still be composed mainly of hydrogen and helium
The first atmosphere of Earth was primarily H and He. During this time, Earth's core was not differentiated and thus the magnetosphere had not yet formed. How did the lack of differentiation in Earth's core most likely affect the transition in Earth's atmospheric composition?
by releasing water vapor from the core into the atmosphere
by magnetically attracting freed metallic elements to the surface
by providing the heat energy that fueled atmospheric chemical reactions
by allowing the solar wind to blow away much of the lighter elemental gases
Which provides the oldest evidence for oxygen accumulation in Earth's atmosphere?
the earliest fossils of animals
the earliest sediments of oxidized rock
impact craters of oxidized-iron asteroids
extensive volcanic calderas of similar age
Which of the following best describes a change in Earth's atmosphere made by early photosynthetic life?
increased level of oxygen
increased level of CO2
decreased ability to support life
decreased ability to transmit light
