The Tigris and Euphrates river valley.
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The two names for horizontal rows on the periodic table are periods and series.
When two Continental plates diverge, landforms like rift valleys and mid-ocean ridges are created. Rift valleys form on land where the plates are separating, while mid-ocean ridges are underwater mountain ranges that form in the ocean.
Plate tectonics create mountains and valleys through the process of tectonic activity. When two tectonic plates collide, one may be forced under the other in a process called subduction, which can create mountain ranges. Conversely, when plates move apart, they can create rift valleys as the crust stretches and pulls apart.
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The two common names for the structure of DNA are double helix and spiral staircase.