The core of the Sun is .
a. at the same temperature and density as its surface.
b. at the same temperature but much denser than its surface.
c. composed of iron.
d. much hotter and much denser than its surface.
e. constantly rising to the surface through convection.

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