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Lelu [443]
2 years ago
12

Why is it difficult to interpret the rock record of Precambrian Time?

Geography
1 answer:
allsm [11]2 years ago
7 0
<span>1. The record is incomplete due to burial, erosion, etc.
2. Much, if not all, are metamorphosed
3. There are (for the most part) no fossils to help with depositional environments or age dating
4. Things worked differently in the Precambrian: limestones were formed different, dolomites may have been primary, detrital systems did not behave the same way (lack of meandering fluvial, for example), reduced atmosphere that enabled mobile Iron that made banded-iron formations, some igneous rocks only formed then and do not form today (i.e. kimberlites), etc</span>
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"a geologist is studying sediments on land that were originally deep sea sediments. she finds the minerals zircon and garnet in
Valentin [98]

Answer:

Terrigenous

Explanation:

The sediments must have been land derieved.

Garnet and zircon are found associated with igneous and metamorphic rocks.

Weathering of these rocks release the minerals into sediments and are hereby transported into ocean basins. They can lithify in the sediments as they get carried along with them.

Terrigenous sediments originates from the land. They are made of rock materials and volcanic deposits. Some of them like volcanic dusts can travel into deeper parts of the oceans as they are lighter and can be carried very far into the ocean.

7 0
2 years ago
How does the shape of the earth affect the climate of diffrent regions please answer!
xxTIMURxx [149]
<span>"Because the Earth is spherical in shape, the areas between the Poles and the Equator benefit from solar energy to different extents over the year. Those areas on the Equator receive the highest levels of solar energy, and that energy declines towards the Poles. The temperatures of atmospheric masses thus differ as one moves from the Equator to the Poles." (http://assandra-sciences.blogspot.com/2010/07/how-does-shape-of-earth-affect-climate.html)

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5 0
3 years ago
Read 2 more answers
Which animal has the biggest heart
Allushta [10]

Answer:

blue whale

Explanation:

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7 0
2 years ago
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On 9 January 1857, the San Andreas fault segment between Cholame and San Bernardino broke loose at its northwestern end, and the
kotegsom [21]

Answer:

On 9 January 1857, the San Andreas fault segment between Cholame and San Bernardino broke loose at its northwestern end, and the rupture propagated southeastward in the great Fort Tejon earthquake with a magnitude of about 7.9.

Explanation:

The Fort Tejon earthquake, which occurred on January 9, 1857, is considered the strongest earthquake that shook the state of California. It is estimated at a strength of 7.9. Its strength is therefore comparable to that of the 1906 San Francisco earthquake. It occurred along the San Andreas Fault 362 kilometers between Parkfield and San Bernardino. The two plates that meet along this disturbance shifted up to nine meters during this quake.  

California was still sparsely populated in 1857. Unlike the New Madrid earthquake of 1811, there are hardly any records of people who have experienced this earthquake. For this reason it is only known among seismologists. According to current research, its epicenter was located near the California city of Parkfield. However, it got its name because of the army camp Fort Tejon, which was located on the Tejon Pass, reported it.

Only one death was reported as a result of the earthquake. The person died in the collapse of an adobe house at Reed’s Ranch in Gorman, very close to the fault. Most of the buildings in Fort Tejon were badly damaged and several people were injured. Some buildings in Los Angeles were destroyed, but no major damage was reported.

6 0
3 years ago
The US labor movement began in the _____. A. 1930s B. 1920s C. 1880s D. 1860s Please select the best answer from the choices pro
Luba_88 [7]

Answer:

1860s

Choice D is correct

Explanation:

The US labor movement began in the 1860s

5 0
3 years ago
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