How does desert varnish form?

What Tropical Rainforest animal will eat fruit and grass? What are the names of Alaska's deserts? What river in the US starts with X? When the settlers arrived in new England many forests were turned into fields eventualy some fields were abandoned and then grew back into forests this is best described as? What are Throne Rooms? What two countries are located entirely within 0 degree and 10 degrees north latitude 50 degrees and 60 degrees west longitude? How do you cheat seaways vice city PSP? What state is close to the Ohio river? When was Kingda Ka made? What country and continent was the Nile river found in? What is a tropical plain? Do you enjoy romantic dinners and long walks on the beach? Is the Dominican Republic an island? Most mysterious ocean area between Florida Keys and Puerto Rico? When was the first canal ever built? How long is the recovery period for Ross River Virus? What desert do blind moles live in? Who protected the medieval castles? How high is mount Snowdon in miles? What region were archaeological findings at the small river valley of Monte Verde show dwellings made from wood and animal skins and the use of fireplaces for cooking?