Obviously not an experiment, becasue nothing affected in real world. Obviously not a system, because a system is a real world thing that functions, like a traffic system. A formula is not an observation, rather an observation is what one uses to deduce a formula. So clearly it is a model.<span>
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Answer:
Most crabs usually stroll on the beach by walking sideways. But crabs can also walk forward, backward and diagonally. Because crabs have stiff, jointed legs, they move faster and easier walking sideways. ... A crab walking sideways pulls itself along with one set of legs and pushes with the other.
The answer would be Activational <span />
Answer:
Climate change may aggravate erosion, decline in organic matter, salinization, soil biodiversity loss, landslides, desertification and flooding. The effect of climate change on soil carbon storage can be related to changing atmospheric CO2 concentrations, increased temperatures and changing precipitation patterns. Extreme precipitation events, fast melting of snow or ice, high river discharges and increased droughts are all climate-related events which influence soil degradation. Deforestation and other human activities (agriculture, skiing) also play a role. Saline soils are expected to increase in coastal areas as a result of salt water intrusion from the seaside because of rising sea levels and (periodically) low river discharges
