Secondary sources are materials that interpret, analyze, or summarize information from primary sources. They include books, articles, documentaries, and reviews that provide commentary or insights on original data or events. Unlike primary sources, which offer first-hand accounts or direct evidence, secondary sources rely on the interpretation of those original materials to present context or further understanding. Examples include historical analyses, critiques, and literature reviews.
Light, Heat, Sound
Website: Korean War
Solar or geothermal energy.
the Mississippi
List solar dealers
air and ship
the pollutions in the air an plants give it off and animal droppings.
to elliminate soures of error
to elliminate soures of error
to elliminate soures of error
to elliminate soures of error
to elliminate soures of error