What makes the pre-archean time different from the others?

during this time, the Earth's crust cooled enough that rocks and continental plates began to form. It was early in the Archean that life first appeared on Earth. Our oldest fossils date to roughly 3.5 billion years ago, and consist of bacteria microfossils.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.