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Waterfalls often form when hard (e.g. granite) and soft (e.g. clay or chalk) rock are present , where water flows across the harder rock and drops onto softer rock. The falling water then starts to form a...

A barrier to entry is any complication or expense a firm might encounter when entering the transport market. There are many barriers to entry such as economies of scale being exploited by pre-existing fir...

The addition of nutrients such as nitrate means that nutrients no longer limit plant growth.Algae begins to bloom which blocks out sunlight. As a result, plants cannot photosynthesise (or photosynthesis i...

dy/dx = 1 - 12x² + 2x^(-5)

This is an unexpected result as usually nutrients are considered beneficial to organisms. Some organisms do benefit enourmously from the nutrients, but this leads to the deaths of other. The high concentr...