Over the last two months, one city saw its population increase greatly because of a flood of new immigrants from Europe. These immigrants were diverse, ranging from engineers and lawyers to plant laborers and the wealthy. All needed to find a place to live in the area. To what might this situation...

A geologist finds a fossil in a rock layer. The fossil has been dated and the approximate age of the fossil has been placed at 10,000 years old. What can the geologist assume about the rock layer based on this data and what principle supports this assumption?

Can someone explain the differences between the bohr and the modern atomic theories in the description of the electron Thanks :p