This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: How do scientists use lake sediments to study past climates? A) Lake sediments contain organic ... (Read 31 times)

ahriuashd

  • Hero Member
  • *****
  • Posts: 535
on: Jul 14, 2018
How do scientists use lake sediments to study past climates?
 
  A) Lake sediments contain organic materials that can be identified to species and radiocarbon dated, thereby giving insight into past plant communities and related climatic conditions.
  B) Isotopic analysis of the relative proportions of 18O to 16O enable determination of evaporation rates from ancient lakes.
  C) During warmer conditions, lake sediments form wider rings, whereas in cooler conditions, these rings are narrower.
  D) The amount and type of pollen in lake sediments is an indication of the macrovertebrate assemblages that dominated an area.
  E) Lake sediment analysis is used to determine which fish species have persisted in a particular lake over long periods of time.

Question 2

The 10C (50F) isotherm for July is used as the environmental criteria to define
 
  A) the Antarctic convergence.
  B) periglacial regions.
  C) the Arctic region.
  D) the Antarctic region.
  E) the extent of Pleistocene glaciation.


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

dawsa925

  • Sr. Member
  • ****
  • Posts: 326
Reply #1 on: Jul 14, 2018
Answer to Question 1

A

Answer to Question 2

C


ahriuashd

  • Member
  • Posts: 535
Reply 2 on: Jul 14, 2018
YES! Correct, THANKS for helping me on my review

parshano

  • Member
  • Posts: 333
Reply 3 on: Yesterday
Gracias!

« previous next »
 

Did you know?

Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

Did you know?

The eye muscles are the most active muscles in the whole body. The external muscles that move the eyes are the strongest muscles in the human body for the job they have to do. They are 100 times more powerful than they need to be.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

Did you know?

Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.

Did you know?

Every flu season is different, and even healthy people can get extremely sick from the flu, as well as spread it to others. The flu season can begin as early as October and last as late as May. Every person over six months of age should get an annual flu vaccine. The vaccine cannot cause you to get influenza, but in some seasons, may not be completely able to prevent you from acquiring influenza due to changes in causative viruses. The viruses in the flu shot are killed—there is no way they can give you the flu. Minor side effects include soreness, redness, or swelling where the shot was given. It is possible to develop a slight fever, and body aches, but these are simply signs that the body is responding to the vaccine and making itself ready to fight off the influenza virus should you come in contact with it.

The proportion of obese and extremely obese adults in the United States has increased over the past The proportion of obese and extremely obese adults in the United States has increased over the past
Harvard Alumni Study show who are more physically active in middle adulthood Harvard Alumni Study show who are more physically active in middle adulthood
Social scientists have not done well at devising theories to explain lovely romantic moments Social scientists have not done well at devising theories to explain lovely romantic moments
You have four guinea pigs for a genetic study. One male and one female are from a strain that ... You have four guinea pigs for a genetic study. One male and one female are from a strain that ...
In 1964 a team of Russian scientists smashed a neon nucleus into a plutonium tar In 1964 a team of Russian scientists smashed a neon nucleus into a plutonium tar
Evidence of past whole-genome duplications Evidence of past whole-genome duplications
Video: Baroreceptor Reflex

For a complete list of videos, visit our video library