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<span>Currently, life expectancy in north america is about 75 years for men and 80 for women.</span>
Answer:
Great Wall of China. Photo by: dowell / Getty Images. ...
Christ the Redeemer in Rio de Janeiro. Photo by: Sam Valadi via Flickr Creative Commons BY-NC-ND 2.0. ...
Machu Picchu in Peru. ...
Chichen Itza. ...
Roman Colosseum. ...
Taj Mahal in India. ...
Petra in Jordan.
I assume you meant to write convection for one of those answers.
<span>Convection is the way that heat is transferred through liquids and gases.
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The core has the largest density, being made of iron and nickel
The mantle has an intermediate density and the crust has the lowest density.