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Past ecosystems

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Complete this activity on past ecosystems.

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Âge recommandé: 16 ans
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Australia

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Compléter

Past ecosystemsVersion en ligne

Complete this activity on past ecosystems.

par Belinda Schirmer
1

abundance fauna rock ecosystems changes environment data observations

Aboriginal art represents a record of human of the dating back as far as 40 , 000 years .
The art depicts the flora and of the past and changes in their .
Scientists can place these observations in context with scientific to form a more comprehensive picture of past and the that took place in them .

2

remains macroscopic impression mineralised existence living paleontological

Geological evidence and evidence provide clues to past ecosystems .
All things can leave a trace of their .
Evidence may include clues such as fossils , moulds and casts , remains or whole .

3

remnants geological iron model atmosphere order isotope effect events record

Geochemical remains include of organic molecules or ratios only associated with living things .
Changes in the can leave traces in the rock , such as banded formations .
The time scale is a scientific that represents past natural in and allows scientists to infer cause an .

4

core change atmospheric climates oceans Antarctica accumulation traces gases pattern dust

Climate is defined as a long - term of ocean and conditions .
Climate alters the chemical composition of and the atmosphere .
The of ice layers in places such as leaves an annual record of and in the atmosphere at the time .
These chemical can be retrieved in ice samples and analysed to help build a more complete record of past .

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