1. malaria 2. rivers had terrible waterfalls..too dangerous...until the steam engine was invented it was incredibly dangerous 3. deserts....they didn't know how to travel through the deserts and find an oasis which made it very difficult to travel through
Answer:
C. Scenic Glen Canyon was covered over by Lake Powell
Explanation:
The Soviet Union enforced the collectivization of its agricultural sector between 1928 and 1940 during the ascendancy of Joseph Stalin. ... The sweeping collectivization often involved tremendous human and social costs.