1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Agata [3.3K]
3 years ago
14

Why is a key bed used?

Biology
1 answer:
Anna11 [10]3 years ago
6 0
In geology, a key bed (syn marker bed) is a relatively thin layer of sedimentary rock that is readily recognized on the basis of either its distinct physical characteristics or fossil content and can be mapped over a very large geographic area.[1] As a result, a key bed is useful for correlating sequences of sedimentary rocks over a large area. Typically, key beds were created as the result of either instantaneous events or (geologically speaking) very short episodes of the widespread deposition of a specific types of sediment. As the result, key beds often can be used for both mapping and correlating sedimentary rocks and dating them. Volcanic ash beds ( and bentonite beds) and impact spherule beds, and specific megaturbidites are types of key beds created by instantaneous events. The widespread accumulation of distinctive sediments over a geologically short period of time have created key beds in the form of peat beds, coal beds, shell beds, marine bands, black  in cyclothems, and oil shales. A well-known example of a key bed is the global layer of iridium-rich impact ejecta that marks the Cretaceous–Paleogene boundary (K–T boundary). Please let me know if it works.
You might be interested in
Question 3 (5 points)
lorasvet [3.4K]
B Carbón dioxide
Not sure
3 0
3 years ago
Read 2 more answers
Who is Albert Einstein?
hodyreva [135]
Albert Einstein is an inventor and scientist, he was one of the main reasons the us is the us right now. Hope this helped!
5 0
3 years ago
Read 2 more answers
Which reaction happens faster A. with enzymes or B. without enzymes
Yuliya22 [10]

Answer:

A. with enzymes

Explanation:

3 0
3 years ago
Please help I don't understand.
sleet_krkn [62]
So your answer seems like it is false
6 0
2 years ago
Read 2 more answers
magine that some members of an aquatic species of motile, photosynthetic protists evolve to become parasitic to fish. They gain
tia_tia [17]

Option:

a.) gain of meiosis .

b.) loss of mobility.

c.) loss of chloroplasts .

d.) no changes would be expected .

e.) gain a rigid cell wall.

Answer:

  • <u>Option-(C):</u> Loss of chloroplasts .

Explanation:

  • The protists are known to have the chloroplast inside there bodies in order to have there own food mostly prepared by themselves in the given manner, since they no more require the chloroplast to produce there own food thus the presence of the pigment will no use to them. And thus after the level of evolution that occurs inside them we do not expect any form of pigments to be found inside there bodies.
5 0
3 years ago
Read 2 more answers
Other questions:
  • True or false? phosphate is released as rocks and sediments wear down
    9·1 answer
  • Which process occurs only in autotrophic organisms? Calvin cycle chemiosmosis Krebs cycle proton pump mechanism
    12·1 answer
  • 1. Which of the following is know as "the glue" that holds our Solar System and Galaxy together? A- Centripetal Force B-Gravity
    8·1 answer
  • Why might it be easy to overlook cancer in its early stages
    12·1 answer
  • Celluar respiration formula
    6·1 answer
  • Think about a pond ecosystem. List 3 examples of relationships between abiotic and biotic factors in ecosystem
    15·2 answers
  • WILL MARK BRAINLIEST. <br> How can PCR and gel electrophoresis be used to identify people?
    11·1 answer
  • 3. Which statement accurately describes the role of the light-independent reactions?
    8·1 answer
  • Need help with number 2 and 5 ​
    15·1 answer
  • Match Column A with Column B
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!