Upwelling is a process in which the deep and cold water rises to the water surface and not sea surface. This process plays an important role in maintaining balance in our ecosystem as it boost the marine productivity by washing the nutrients from deeper waters to the photic layer where photosynthesis is promoted.
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Land use goes up as human population goes up. This is because the more people there are alive, the more land that people will be using. Hope this helps :)
Controlled burning? I think that's right.
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Your respiratory system is the network of organs and tissues that help you breathe. This system helps your body absorb oxygen from the air so your organs can work. It also cleans waste gases, such as carbon dioxide, from your blood. Common problems include allergies, diseases or infections.
There would be a much more severe cause of global warming if there is a sudden increase in greenhouses gases. With greenhouse gasses such as carbon dioxide, the heat of the earth cannot be penetrated through the atmosphere and will be trapped, the sunlight also cannot be reflected.
