________is the technology for building dams, canals, roads, and bridges.

The cutting down of tress can result in

Most second-level economic activity is_________.

A (n) _______is a resource that can be replaced, such as water.

A useful material found in the environment is called a (n)__________.

Exhaust from cars and trucks is a source for ________.

Deforestation can lead to a loss of_________

________________is a technology for structures that alter the landscape.

A resource that can not be replaced is called a ______.

Trees are the ________ for paper and wood.

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