I just read the following:
She threw herself out the window, wings spreading wide as she plummeted to the earth, catching the wind before she crashed.
What? If she plummeted to the earth, how did she not crash?
Of course it should be "plummeted toward the earth" (or "towards" if you follow that convention).
This is one of the most common mistakes I come upon.
The main difference between 'to' and 'toward is that 'to' shows the result of an action while 'toward' does not convey any result.