Western European nations maintained democratic political systems.
Three-fourths of the over 500,000 lakes in Europe are found in "c. Norway, Sweden, Finland, and Russia," since these areas have the most access to the Norwegian Sea.
The opening of the Panama Canal affected transportation because now, sailors didn't have to sail ALL the way around South America.
When sedimentary rock go to the bottom of a seafloor it sticks together over time and turns into metamorphic rock. Then metamorphic rock melts and when it cools down it turns into igneous rock. This process happen over and over and its called rock cycle.