What makes the core of the Earth denser than the mantle? a. because the mantle isn't as hot as the core

b. because the core is under much more pressure causing more density

c. because the core is metallic iron and nickel which are denser than the materials than in the mantle

d. because the inner core is solid, and the mantle is semi-solid

C.

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Explanation:

it would lead to upper respiratory infections and pneumonia.

lunar landing mission. apollo 11 was the first manned mission to land on the moon. the first steps by humans on another planetary body were taken by neil armstrong and buzz aldrin on july 20, 1969. the astronauts also returned to earth the first samples from another planetary body.

explanation: