Changing a river into a lake is basically what a large dam does. One reason we do this to create reservoirs of freshwater. However, dams change the local ecosystem in a big way.
What is one negative impact of building a dam?
A) Dams are needed to create hydroelectricity.
B) Dams can create smog that pollutes the lake.
C) Dams can help reduce the intense heat of summer.
D) Sometimes people who lived along the banks of the river are displaced.

In november 1987, a massive iceberg broke loose from the antartic ice mass and floated free in the ocean. the chunk of ice was estimated to be 98 mi long, 25 mi wide, and 750 ft thick. a typical backyard swimming pool contains about 24,000 gallons of water. how many of these pools could you fill from the water in this iceberg? (assume the iceberg is a rectangular solid of the above dimensions and consists of water only). express answer in scientific notation.