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Geography Revision

The Living World ­ Unit 1
An ecosystem includes all the living and nonliving parts in an area. The organisms in
ecosystems are classed as producers, consumers and decomposers. Here are some key
words you need to learn for ecosystems.

Producer ­ Uses sunlight energy to make…

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Less snakes because there is less food, so more toads as there are less snakes to eat

Tropical rainforest are mainly found around the equator.

A tropical rainforest has a hot, wet climate with no definite seasons. In general, tropical
rainforests have hot and humid climates where it…

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The Rainforest Layers

1. 40m ­ the emergent are the tops of the tallest trees in the rainforest. These are
much higher, and so are able to get more light than the average trees in the
forest canopy.
2. 30m the canopy is
where the upper parts of most of…

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These are 15* 30* north and south of the equator. The days are incredibly hot, whilst
nights are very cold. There is very little rain, but when it does rain, it varies a lot.

The soil is usually shallow with a coarse gravelly texture and it's not very fertile.

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Commercial logging activity new roads divide up parts of the rainforest and can cut
off connections between different biotic and abiotic systems.
Land clearance for farming, transportation and mining can lead to deforestation.
Hardwood trees take many years to grow so can be difficult to replace.
Fertile soils that make…

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Possible strategies include:

Agroforestry growing trees and crops at the same time. The lets farmers take
advantage of shelter from the canopy of trees. This prevents soil erosion, and the
crops benefit from the nutrients from the dead organic matter.
Selective logging trees are only felled when they reach a…


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