Examlex
Most Americans are not very precise in distinguishing between the terms race and ethnicity.
Oldest Rocks
The earliest-formed rocks on Earth or within a specific geological setting, often found in the deepest layers of the Earth's crust.
Mass Extinctions
Significant global events in the Earth's history where large percentages of species die out in a relatively short period of time, often due to catastrophic environmental changes.
Geologic Timescale
A method of dating based on the chronological correlation of Earth's geological layers to time, utilized by geologists for depicting the sequence and association of historical events on Earth.
Seafloor Spreading
The process by which new oceanic crust is formed at mid-ocean ridges and slowly moves away from them.
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