How Do Scientists Use Lake Sediments to Study Past Climates

question 44

Multiple Choice

How do scientists use lake sediments to study past climates?

• A)Isotopic analysis of the relative proportions of 18O to 16O enable determination of evaporation rates from ancient lakes.
• B)Lake sediments contain organic materials that can be identified and radiocarbon dated,giving insight into past plant communities and climatic conditions.
• 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.

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