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www.reference.com/article/primary-source-5b9b02b31205a193

A primary source is a document used in research that provides first-hand, direct evidence of a particular time period or event. These sources are either recorded directly at the time the event took place, or chronicled at a later date.

www.reference.com/article/primary-colors-34d5ef86faeb4230

The colors that never result from combining two other colors are the primary colors of pigment, while the colors that produce white light when combined are the primary colors of light. Each of these categories includes three primary colors.

www.reference.com/article/primary-producers-e2dc6ea8f3807acc

Primary producers, also called autotrophs, are organisms that can produce their own food. Most autotrophs lie at the bottom of the food chain, serving as food sources for animals farther up the line. Primary producers are self-sufficient when it comes to meals: they produce their own food using ligh

www.reference.com/world-view/considered-primary-source-62d75d674d269b3

Generally, primary sources are considered as documents or footage that was created during the time of an event. If no primary sources are available, other sources can be considered primary for this purpose.

www.reference.com/article/example-primary-source-ea8f5b0a09486311

To qualify as a primary source, the object or document must have been written or created during the time period studied. Primary sources are created by eyewitnesses and offer direct evidence. A diary, such as The Diary of Anne Frank, is an example of a primary source.

www.reference.com/business-finance/examples-primary-industries-b95ad5d33e82246c

Primary industries are those that harvest or extract raw materials from nature; they include agriculture, oil and gas extraction, logging and forestry, mining, fishing and trapping. In many countries, primary industries provide raw materials for manufacturing and heavy industries and are a stable ec

www.reference.com/article/long-primary-succession-9d41f47b0f4b9936

Forests can grow from bare rocks in about 150 years, according to the U.S. Geological Survey. Many scientists study primary succession in Hawaii because the lava flows from volcanoes create places where primary succession can take place. Because primary succession requires the accumulation of soil,

www.reference.com/article/three-primary-colors-9ef799d922f53531

Red, yellow and blue are the three primary colors. Primary colors are colors that make up every other color on the color wheel, and no other colors can be combined to create red, yellow or blue.

www.reference.com/article/example-primary-market-c7d42e480a847a8f

An example of a primary market is a company's initial public offering, or IPO, in which it sells its stocks to the general public for the first time. The primary market refers to a situation in which a company creates securities prior to them being traded on the secondary market.

www.reference.com/science/primary-secondary-colors-895d42630393d118

Color is a critical part of our everyday world. If you’ve ever watched an old TV show in black and white, then you know how drab and dull everything would look and feel without the vibrance of color. Colors help us express our personalities, promote specific moods, decorate spaces and simply add a t