a method of procedure that has characterized natural science since the 17th century, consisting in systematic observation, measurement, and experiment, and the formulation, testing, and modification of hypothesis.

Scientific method

Explanation:

Scientific method are the series do processes that are carried out by scientists to ensure findings are very accurate.

This methods include observation, experiments. After this methods the hypothesis is usually formulated. The formulated hypothesis is then tested for exceptions and other factors. If any is found the hypothesis is modified to include the new findings and exceptions discovered.

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there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.