Where is tornado alley in the usa located? and why do tornadoes occur so frequently there?

Which theory suggested that the earth was once a signle supercontient that gradually that broke up into the contients that we know today

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?

The economies of nordon could be described a. unable to use rich resources b. struggling but diverse c. dependent on one product d. healthy and diverse