What is a mountain range that serves as a border between two countries

The graph below plots the temperature and luminosity of stars on the main sequence.

Good scientists always report their observations and results truthfully. this is especially important when a scientist's results go against previous ideas or predictions. coming up with inventive ways to solve problems or produce new things

The oldest seafloor in the atlantic ocean is located closest to the edge of the continents. explain how this age can be used to figure out when north america first began to separate from europe