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almond37 [142]
3 years ago
10

Explain the method scientists use to study how Earth’s atmosphere and climate have changed during the past million years.

Biology
2 answers:
Flauer [41]3 years ago
5 0

Answer:

There are various methods that scientists have applied in order to understand the earth's changing atmosphere and climatic conditions are as follows-

(1) By studying the tree rings, which describes that the broader tree rings indicate a wet and warmer temperature, whereas, close and thinner rings indicate a dry and colder type of climate.

(2) Dating the ice core samples and obtaining the data, the scientists have determined the time when the large thickness of snow has accumulated in the past, depicting a very cold climate in the past.

(3) The study of pollen grains that were eroded and deposited at the bottom of an ocean, lakes, and seas also provides a good piece of information regarding the ancient climate.

(4) Coral reefs have been deposited very recently, about 5000 to 10000 years back, which were formed in the tropical climatic condition.

These are some of the ways by which the scientists were able to construct the palaeoclimate.

Stella [2.4K]3 years ago
3 0
Examining fossil and pollen records Extracting deep ice cores from glaciers and the polar ice caps Examining growth rings on trees All of these methods provide clues to past temperature, precipitation, and wind patterns as well as the chemical make-up of the atmosphere.
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Does any landform on Earth’s surface look the same as it did 5 million years ago? explain why or why not.
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Answer:

Earth's surface didn't look much different. With few exceptions.

The global climate is cooler and drier, and seasonal, similar to modern climates. As the climate began to cool down grasslands continued to expand and forests started to dwindle in extent. In the seas, kelp forests made their first appearance and soon became one of Earth's most productive ecosystems. Water from the Atlantic Ocean poured in through the Strait of Gibraltar to deluge the Mediterranean Basin. The event is called the Zanclean flood. Parts of of southern Norway and southern Sweden that had been near sea level rose to form the Hardangervidda plateau and the South Swedish highlands.

Shorty after, the glaciations, uplift of the Rocky mountains and Panama seaway closure began to reshape the Earth.

Explanation:

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The layer of rock and mineral fragments produced by weathering, and covering nearly all of Earth's land surface, is called _____
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The answer is sediments because sediments break down and are every where on earth also break down due to weathering
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Which is the most inclusive division of time on the geologic time scale?
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The thymus is the only lymphoid organ that does not ________.
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Compare and contrast light microscopes, scanning electron microscopes, and transmission electron microscopes. Sort each statemen
podryga [215]

Answer:

<u>Light microscope</u>:

  • use a beam of light to produce magnified images
  • can be used to examine living cells and tissues

<u>Scanning electron microscope</u>:

  • use a beam of electrons to produce magnified images
  • can be used to examine DNA
  • can be used to examine cells

<u>Transmission electron microscope</u>:

  • use a beam of electrons to produce magnified images
  • can be used to examine DNA
  • can be used to examine cells

Explanation:

Light microscope: is a commonly used microscope also known as compound microscope. Magnifies images from 40X upto 1000X. It uses ray of visible light to produce a magnified image. The light microscope can be used to view specimen of both living and dead cells or tissues. However, it doesn't give a detailed view of a specimen like electron microscope.

Scanning electron microscope: It uses electron beam as an illuminating source. It has a much higher resolving power than light microscope because it uses electrons instead of light. It magnifies object upto 500000 times the actual size. Internal structures can also be viewed. However, only dead specimen can be used because the beam of electrons can kill the cells. They are of two types:

  1. <u>Scanning electron microscope(SEM): </u>an electron beam passes over the specimen's surface and displaces electrons which are then focused on  a screen to form an image. Images appear in 3-D
  2. <u>Transmission electron microscope: </u>electromagnets magnify the image by passing beam of electrons through a thin specimen. Images appear in 2-D

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3 years ago
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