A farmer who has grown corn for the past five years notices in the sixth year that his harvest is significantly smaller, despite an increase in labor on the farm. The following year, the harvest continues its decline. Which of the following explanations most plausibly accounts for the reduction in corn yield? A. soil degradation B. desalinization C. better irrigation D. terracing

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