The kind of growth that actually occurs when population growth is unchecked is: exponential growth.
Population refers to the number of a particular species of living things occupying an area of land. It's usually used to know the number of people living in a geographical area.
When the population growth is left unchecked, rapid growth in population is recorded. Such rapid population growth can become unsustainable.
Thus, such population growth is known as exponential growth.
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