What problems do camel caravens crossing Sahara Desert face?

How do zoos care for wallaroos? When was Oga Quasi-National Park created? What is located in the corium? With what initial velocity must an object be thrown upward from ground level to reach the top of the Washington monument approximately 550 feet? Why did the Jewish people begin to pray at the western wall? Where tectonic lakes are located? What river is part of the segway connecting the five great lakes to the Atlantic ocean? What is the collective name for the five lake that include lake Ontario? What are some limiting factors of the everglades? How many different kinds of spiders live in rain forests? Is the brown colour in a river a colloid or solution or suspension or an emulsion? What is dorney park like? Is unclear sense of you an aspect of postmoderlism? A sentence for the word bastion? What are physical landmarks in the US? When was Tunnel Through the Deeps created? What sea is closest to the Arctic Ocean? Does the Mediterranean Sea have alligators? Name something that has an arch? Is this true or false far less fresh water is located underground than in all Earth's rivers and lakes?