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Past ecosystems

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Complete this activity on past ecosystems.

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Edad recomendada: 16 años
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Completar Frases

Past ecosystemsVersión en línea

Complete this activity on past ecosystems.

por Belinda Schirmer
1

abundance fauna ecosystems data observations environment rock changes

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

paleontological impression remains mineralised macroscopic existence living

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

order geological effect record atmosphere model isotope events remnants iron

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 dust oceans Antarctica change traces climates accumulation gases pattern atmospheric

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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