What type of matter is Lava?? Solid OR Liquid??

Which barrier to economic development is shown in the following examples?

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

Many countries in africa have had difficulty creating democratic governments following their independence. all of the following issues have most likely contributed to this problem, except