The Rio Grande is not shared by the United States and Canada.
Water pollution affects marine ecosystems by completely killing it off. Pollution kills fish, reefs, and other underwater life. With this pollution, animal's behaviors can change, and habitats are destroyed.
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1) Divergent boundaries because they cause new crust to form.
2) MORS are underwater mountain ranges that rise to connect with the continents and form new crust. The lava gets pushed under the oceanic crust.
Often, waterfalls form as streams flow from soft rock to hard rock. This happens both laterally (as a stream flows across the earth) and vertically (as the stream drops in a waterfall). In both cases, the soft rock erodes, leaving a hard ledge over which the stream falls
If tectonic plates collide it forms convergent plate boundaries. if tectonic plates separate they form divergent plate boundaries