'By examining these in some trees, you can figure out what the weather was like thousands of years ago'
the rings
OUR TROUBLED PLANET: By examining these in some trees, you can figure out what the weather was like thousands of years ago
By examining these in some trees, you can figure out what the weather was like thousands of years ago
By examining these in some trees, you can figure out what the weather was like thousands of years ago
OUR TROUBLED PLANET
the rings
OUR TROUBLED PLANET