Answer: A. Air bubbles trapped in a layer indicate how much CO2 was in the atmosphere the year the layer formed.
Explanation:
When ice cores were formed, they included air bubbles that got stuck during the formation. Scientists can study these air bubbles to find out how much carbon dioxide is in them as this will show the proportion of carbon dioxide in air at the time the core was formed.
They can then compare those figures to current carbon dioxide levels to see if there has been a change. This change will give proof of climate change.
Answer:
maximum at urban and minimum at ruler areas as per studying
They're called resin identification codes, and they indicate the type of plastic that an item is made from. These numbers alone do not indicate whether a package is recyclable, but can be used in conjunction with instructions from your community to help you know the types of plastics can be recycled where you live.
Answer:
The Darien Gap is located between Central & South America
Explanation:
There are no roads that span the jungle here, only footpaths. While a handful of expeditions have crossed by land vehicles, it's not something most people can accomplish.
