Examlex
The oldest rocks found on the Earth's surface date back about ________ billion years.
CIA Laboratory
A facility or section within the Central Intelligence Agency where scientific research, experiments, and analysis are conducted, possibly related to espionage or intelligence operations.
Africa
A continent rich in cultural diversity, natural resources, and history, often noted for its significant socio-economic and political diversity.
Nuclear Weapon
A weapon of mass destruction that utilizes nuclear reactions, either fission or a combination of fission and fusion, to generate an explosion with devastating effects.
Tacit Approval
Implicit consent or agreement without direct acknowledgment or expression.
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