Gross domestic product tracks the health of a country's economy. It represents the value of all goods and services produced over a specific time period within a country's borders. Economists can use GDP to determine whether an economy is growing or experiencing a recession.
Answer:
Ice wedges are a big cause of potholes in roads and streets. As ice forms in the cracks of a street, the water expands and pushes against the surrounding rock, making the cracks wider, eventually breaking apart the rock.
Because they are at the intertropical converge zone. Which is where air rises due to direct solar radiation causes water vapor to fall back to earth as rain.
Road density can be determined by simply dividing the length of road in a polygon by the area. It can also be produced by using a road density AML, which runs in ARC/INFO GRID. This program creates a grid of road density by using a circular, moving window. Must have a roads coverage for the GIS process.