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____________ is the measure of how many different species live in a particular ecosystem.
Mineral __________ is the removal of commercially valuable amounts of solid mineral resources from the earth.
A _______ environment is a natural area that is easily disturbed and difficult to restore.
______________ refers to the basic equipment a place needs to function (e.g. roads, sewage, water) .
________ include ores, which contain metals, such as iron; precious stones, such as diamonds; building stones, such as granite; and solid fuels, such as coal.
__________ is ground that is permanently frozen.
The _____ regions surround the north and south poles.
______ is a biome where the ground is frozen for most of the year and there is very little precipitation.
A __________ area is a natural environment that is left intact and undisturbed by human activity.
