- The radius of the earth, and the radius of the sun.
- The age of the universe, and the age of the Earth.
- The length of time which life has existed on the Earth, and
the length of time which human beings (or hominids) have
existed.
- The height of Mt. Everest, and the depth of the Mariana
Trench.
- The speed of sound (in air), and the speed of light (in a
vacuum).
- The thickness of the Earth's inner core, outer core, mantle,
and crust.
- How long ago dinosaurs first appeared on Earth, and when
they became extinct.
- The size of a (typical) zooplankton, and the length of a
great blue whale.
- The value of π (pi), approximated to at least 5
decimal places (i.e., to at least the hundred-thousandths
place).
- The abbreviation "c.c." stands for _________________________.
(Hint: it's
a unit of volume)
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