2. Describe a positive or negative feedback loop involving snow/ice, methane or

Question

2. Describe a positive or negative feedback loop involving snow/ice, methane or carbon dioxide and how it would increase or decrease global warming.

The impacts of acid deposition on forests has been linked to NOTE: there are more than one correct answer. O ower pH levels in the soil. O uncontrolled forest fires. O weakening trees so they become more susceptible to other types of damage (disease, frosts) O experiments by extraterrestrials gone ba O causing plants to grow too quickly O elease of toxic aluminum ions from the soil damaging tree roots

Explanation / Answer

Question 1: The impact of acid deposition on forests has been linked to ;

Answer: Lower pH level in the soil, weakening trees so they becomes more susceptible to other types of damage, release of toxic aluminium ions from the soil damaging tree roots.

Low pH and high aluminum ion concentrations cause a stunting of the root growth and prevent the roots from taking up nutrients from the soil and it results in overall slowing of the growth of the entire tree. Thus it reduces populations of soil microorganisms.

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