Examlex
There is about 1-2% of ______________ added to the filament to increase thermionic emission.
Gifford Pinchot
Known as the father of American conservation, he was an advocate for the sustainable management of natural resources in the United States.
Conservationists
individuals or groups that actively work to protect and preserve the natural environment and wildlife.
Earth Day
An annual event celebrated on April 22 worldwide to demonstrate support for environmental protection.
US Forest Service
A federal agency that manages public lands in national forests and grasslands with the goal of sustaining the health, diversity, and productivity of the nation’s forests and grasslands for present and future generations.
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