the sahara desert switches from sand to jungle back to sand every 20,000 years. what is the cause for this change?

What are the answers for the following questions?

In yusel komunnyakaa's camouflage the chimera what is a chimeraa animal coming to vietnamb a type of military outfitc mythological creatured nick name for military units

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?