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By issuing the Declaration of Independence<span>, adopted by the Continental Congress on July 4, 1776, the 13 American colonies severed their political connections to Great Britain. The </span>Declaration<span> summarized the colonists' motivations for seeking</span>independence<span>.</span>
for better research go to under NOAA - Climate.gov
This is a short paraphrased summary of the article about ice cores in that website.
Answer: Researchers in labs may melt or crush bits of the ice core a little at a time, each deeper layer shows the time in the Earth's climate history. Tiny pieces of pollution, metals, radoiactive fallout, pebbles, sea salt, volcanic ash and even air bubbles all present important information that researchers can look for to track changes in the atmosphere's composition and temperature.
The closest planet to the sun would be Venus.
