Answer:
5 centimeters
Explanation:
The seafloor is spreading at rates of around 5 cm usually, though it can go up to 16 cm per year but rarely. The seafloor spreading is caused by the geological activity at the places where there's divergent plate boundaries. As the plates move away from one another they leave thin and fragile crust behind which is easy to break through for the magma. As the magma gets through and reaches the water, it starts to cool off very quickly, constantly pulling up and creating new crust, pushing the old crust sideways and further away from the divergent boundary.
Answer:
Pretty sure is Automobile
because the other inventions is pre-civil war
A blossoming of the African American culture, mostly in art and literature. It was the most influential movement. It was considered a golden age in African American culture.
The primary obligation that Pericles believed Athenian citizens had to the state was to vote, since Athens was a "direct democracy" in which all eligible citizens could vote directly on legislation.