Explain how trees can "fall up." How does this situation help the local economy? (Site 1)

The dam in Brazil was three years late. The trees below the surface of the lake were thought to be gone. Many trees actually still stand. The trees were then used for products. People would swim to the bottom of Lake Tucurui and use hydraulic chainsaws to cut the trees. Once the trees are cut, they shoot up to the waters surface. Trees falling up is a term used because of the trees that shoot upward to the top of the lake. This situation helps the local economy because the wood from cleared rainforests is turned into products that can be sold throughout the world. The algae on the trees help keep the tree in its shape.

Explanation:

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a characteristic is a deep cut in the earth or left over rock aka till.