What is the causes of rural urban migration

What does the word submerged mean in the following sentence? after it rained for three days in a row, the streets were completely submerged.

A/an map shows the types of rock and/or sediment present in a particular region.a map that uses a range of colors and shading to represent the elevation, depth, or landscape of specific features on earth is a/an map.to show the dominant weather pattern in a region over a long period, a scientist is likely to create a/an map.a map has contour lines, which connect points at the same elevation.a map that uses shading to represent rates of violent crime across a state is an example of a/an map.

What is the approximate circumference of the circle shown below? 12.2 cm