Environmental Science
Man made sources of radiation pollution are:

all of these
mining
nuclear fuels and preparation of radioactive isotopes
explosion of nuclear weapons

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

All of these
Receive less sunlight during a year than the south-facing side
Grow a variety of trees that are typically observed at higher elevation
Be a better location for a ski run than the south-facing side
Have snow on the ground for a longer period of time in winter compared to the south-facing side

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Environmental Science
Definition of ecosystem is

The part of the earth and its atmosphere which inhibits living organisms
The abiotic component of a habitat
The community of organisms together with the environment in which they live
A community of organisms interacting with one another

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