A Stratum is a layer of rock in the ground
It should be D
The United States is a More Developed Country (MDC)
<span>c. Massachusetts, New Hampshire, Rhode Island, Maine, Vermont, Connecticut
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Contour lines determine the steepness of the land by how close they are together. Generally, contour lines rise to a particular scale (e.g. a line for every ten metres), therefore, if the contour lines are closer together then the height of that particular area has risen more steeply than if the contour lines are further apart where the steepness has increased more gradually.
