Why do magnetic stripes appear on the seafloor?
o
a. the seafloor spreads apart, creating new rocks that record
magnetic orientation,
o
b. cooled rocks change their magnetic orientation when the pole
reverses
c. rocks align themselves to earth's gravitational field.
o
o
d. different types of rocks align differently to magnetic fields.
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i believe it is 40–40–20%

explanation:

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

it is b that is the answer.