Colorado Public Radio2d
Where do Colorado’s foothills end and the mountains begin? Experts say it’s complicated
Maybe it’s the rocks, maybe it’s the elevation or maybe the animals that live there. The question has fascinated scientists ...
Hosted on MSN3d
What's inside the moon? Gravity measurements suggest a layer of molten rock
Deep below the Earth's crust, molten rock rises and falls, driving the movement of tectonic plates on our planet's surface — and for some time, researchers have debated whether the moon also has a ...