What layer of the atmosphere is known for having temperatures as low as -90•c

What is most likely the effect of unrestricted hunting of gray wolves on the food web of the region

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

After railroads, the next revolution of transportation came with the development of (a) automobile (b) telegraph (c) steam engine