by satillites.
he studied the earth and what he think it looked like
afroctistious
a doctorinmay
There are no asteroids being tracked, studied, or observed for which any point in their orbit coincides with any point in Earth's orbit at any time in 2012.
eratosthenes and aristarchus
earth's features and its inhabitants
he found out the earth was round when he studied geography
The left side of a table typically lists the categories being studied.
The tetragonal space group of the crystal structure being studied is P4/mmm.
Genetics...
geologist
A geologist studies rocks and the earth.