Who found evidence that the continents were joined together at one time?

What is the difference between external & internal migration

Why is oman trying to develop its tourism and manufacturing sectors?

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons