One of the reasons that participants in experiments are not told what the researcher is testing is because the participants might act differently if they
knew. When this happens it is known as the:

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

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