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The Prime Meridian is an imaginary line that, similar to the Equator, divides the earth into eastern and western hemispheres. It is sometimes referred to as the Greenwich Meridian. All lines of latitude and longitude are measured in degrees.

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an imaginary line drawn around the earth equally distant from both poles, dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.

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hemisphere. One half of a sphere, formed by a plane that passes through the center of the sphere. Either the northern or southern half of the Earth as divided by the equator, or the eastern or western half as divided by a meridian, especially the prime meridian.

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Map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. For example, on a 1:100000 scale map, 1 cm on the map equals 1 km on the ground.

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North, south, east, and west are the only true directions. The directions on the compass that are halfway between these cardinal points are called northeast, southeast, southwest, and northwest. These in-between points are called intermediate directions.

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Cardinal Directions are the most commonly used forms of direction. and include North, South, East and West. The four equal divisions - Northeast, Southeast, Southwest and Northwest - are called Primary Inter Cardinal directions.

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A compass rose, sometimes called a windrose, or Rose of the Winds, is a figure on a compass, map, nautical chart, or monument used to display the orientation of the cardinal directions: North, East, South, and West—and their intermediate points. It is also the term for the graduated markings found on the traditional magnetic compass. Today, the idea of a compass rose is found on, or featured in, almost all navigation systems, including nautical charts

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Definition of key. A key is used to identify the number of categories present in a graph. It is also called a legend. A key on a pictograph tells us how many each picture stands for. Look at the following pictograph.

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Political maps are designed to show governmental boundaries of countries and states. They can also indicate the location of major cities, and they usually include significant bodies of water.

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Physical maps often include much of the same data found on a political map, but their primary purpose is to show land forms like deserts, mountains and plains.