Chapter 2: How To Answer Data-Based Questions

An arrangement of information in columns and rows.  A table is used to organize information so that individual facts can be easily found and compared. 
Bar Graph
A graph made of parallel bars with different lengths.  It is often used to compare two or more things.  Sometimes a bar graph shows how one thing has changed over time. 
An area of a map that lists the symbols used and identifies what each symbol represents
Horizontal Axis
The line that runs along the bottom of a graph.  It often identifies what the bars mean
Vertical Axis
The line that runs along the left-handed side of a graph.  It usually measures the lengths of the bars. 
Line Graph
A graph composed of a series of points connected in a line.  A line graph is often used to show how something has changed over time
The general direction in which things are moving.  We can often see a trend by examining the movement of a line on a graph. 
Circle Graph
Also sometimes referred to as a pie chart.  It is a circle divided into sections or slices of various sizes to show relationships between the whole and its parts

An image taken with a camera, showing what a place or person looks like.  Photographs are used to record visual information


Aerial Photograph
A photograph taken from an airplane or a satellite in outer space.  Aerial photographs are useful to geographers to show the surface features of an area
A person who makes maps
A simplified picture that often shows how several things are related or how the different parts of something work together.  The purpose of a diagram is to help the reader visualize how something works or how it is organized
Primary Sources
Original records or first-handed testimony of an event under investigation.  They include eyewitness reports, official records from the time of the event, letters by people involved in the event, diaries, speeches, photographs, and oral histories. 
A primary source in the form of an object.  Artifacts include buildings, clothing, furniture, jewelry, and pottery. 
Secondary Sources
The writings and interpretations of later writers who have reviewed the information in primary sources.  Secondary sources include textbooks, encyclopedia articles, magazine and newspaper articles
A short restatement or rewording of a text

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