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Bipina Poudel Geography

The intersecting lines drawn on maps and globes

Question

The intersecting lines drawn on maps and globes are...

Options
Option A

geographic grids

Option B

longitudes

Option C

latitudes

Option D

None of the above

Correct Option

Option A

Explanation

The geographic grid refers to the internationally-recognized system
of latitude and longitude used to location positions on Earth's
surface. Accurate use of this coordinate system is fundamental to the
science of geography, which relies so heavily on maps as a medium
of communication and analysis. The system of time zones, also
internationally accepted, is based on longitude and the speed of
Earth's rotation.

Even with billions of people living on Earth, you could pinpoint the location of each person in a building or city. It may take a lot of time, but you could do it by using a set of lines and coordinates called the geographic grid.

Background

Ptolemy, a Roman mathematician, geographer, astronomer and astrologer, created the geographic grid sometime in the second century.

Facts

The geographic grid uses latitude and longitude lines. Latitude lines are invisible lines that run east to west around Earth. Longitude lines run north to south around the length of Earth.

Specifics

Both latitude and longitude lines divide the Earth into 180 equal sections from north to south (latitude) and from east to west (longitude). The lines are measures in degrees.

Features

The equator, which falls halfway between the North and South Poles at zero degrees latitude, marks the center of the Earth from north to south. The prime meridian, which goes through Greenwich, England, at zero degrees longitude marks the center of the Earth from east to west.

Misconceptions

Understanding latitude and longitude can be confusing. Although latitude lines run from east to west, they give a north/south location. Longitude lines, while running from north to south, give an east/west location.

Uses

Pilots or ship captains use latitude and longitude lines to find the shortest distance between two points. You can also use the geographic grid to give a specific location, by giving the intersection of the latitude and longitude lines at that point.

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