Physics
Why is it difficult to breathe at higher altitudes?

Due to low air pressure
Due to high humidity
Due to ozone
Due to low temperature

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Physics
It is easier to roll a barrel full of coal tar than to pull it because

coal tar is a liquid and it flows in the barrel when it is rolled
the full weight of the barrel comes into play when it is pulled
more surface area of the barrel is in contact with the road when it is pulled
the rolling friction is much less than the sliding friction

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Physics
Which is evidence that supports the dynamo theory?

Earth's outer core contains liquid that conducts electricity
Granite and basalt conduct electricity
Convection occurs in Earth's inner core
Earth's core contains a large amount of iron

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