Only answer if you are positive to increase the validity and reliability of the results of experiments with groundwater, several people should (2 points)

repeat the results many times

study only pure sources of groundwater

obtain information only from secondary sources

provide different results of the same experiment

Altocumulus, altostratus, cirrocumuls, cirrostratus, cirrus, cumulonimbus, cumulus, nimbostratus, stratocumulus, stratus 8.) clouds with tallest vertical development 9.) low altitude clouds in solid layers that produce rain 10.) high altitude thin flat layers of clouds 11.) rain clouds that form under stable atmospheric conditions 12.) middle altitude clouds with globular appearance