Examlex
The appearance of _____ on Earth due to the action of photosynthetic bacteria occurred about 2.7 billion years ago.
Land Degradation
The decline in the quality of land due to human activities, environmental change, and other factors, leading to decreased agricultural productivity and the loss of land's ability to regenerate.
Conventional Oil
Petroleum extracted through traditional drilling methods, as opposed to unconventional sources like oil shale and tar sands.
Unstable Nucleus
An atomic nucleus that has excess energy and is in a state where it can undergo radioactive decay to reach a more stable form.
Stable Nucleus
An atomic nucleus that is not prone to radioactive decay and remains unchanged over time.
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