The graph below is the Keeling Curve,a record of carbon dioxide measured at Mauna Loa beginning in 1958.What can be learned from this graph? What do the two lines (black and grey)tell us? 
Definitions:
Hyperlink
An element in digital documents or web pages that links to other sections of the same document or to entirely different documents or web resources.
Insert Hyperlink Dialog Box
A pop-up interface within software applications that allows users to create a hyperlink by specifying the URL and text to display.
Link Button
An interactive element in digital documents and web pages that, when clicked, directs the user to another section of the document or a different webpage.
Remove Hyperlink
The action of deleting a link embedded in text or an object, disconnecting the reference to a web page or document.
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