Developed from the 1950s through the 1970s, plate tectonics is the modern version of continental drift, a theory first proposed by scientist Alfred Wegener in 1912. Wegener didn't have an explanation for how continents could move around the planet, but researchers do now.
Answer: north america!
Explanation:
according to the UTM Grid zones Map, 60 degrees north and 100 degrees west should locate at north america
An active crowd is when there are an lot of people!
I believe the answer is: positron emission tomography
positron emission tomography refers to a medical technology that is used to provide functional imaging on parts of our body. This technology probably more known as PET-scan. When we use this to provide imaging to human's brain, we can observe several part of the brain would light up during a certain activity due to heat.