It's hard trying to guess the age of twins, so you try to make comparisons to see who might be older.

They would know the exact ages of their children considering that one is older and one is younger.

It's like a pancake stack. Mostly because you have to cook the bottom part of the pancake first, before stacking on a newer and fresher pancake.

It's like a pancake stack. Mostly because you have to cook the bottom part of the pancake first, before stacking on a newer and fresher pancake.

Fossil's form when an object/organism dies, and becomes compacted and cemented by sediment.

This shark tooth fossil was found in Minnesota. Since it's quite impossible for a shark tooth to be found in MN, It tells us that a ocean probably covered part of Minnesota.

According to this picture, this is a human fossil. The foot is larger than average, and you can make guesses of whether this was cemented by mud, or was created because of volcanic ash.

This is another example of a human fossil. This was found in Pompeii, Italy. There was a catastrophic volcano that erupted and covered the city of Italy with ash. Many people died, but their bodies were still preserved.