Magnetic reversals have to support
a. the theory of pangaea.
c. sea-floor spreading.
b. the age of the earth.
d. the theory of gondwana.

Correct answer choice is :

C) Sea-floor spreading.

Explanation:

The Earth's magnetic field is believed to be produced by fluid changes in the liquid, outer part of the Earth's core, which is mainly formed of iron. The reversal method is not completely intermittent as it is on the sun, whose fascinating field changes every 11 years. The geologic record shows that numbers of pole cancellations have happened during Earth's history, they happen when pieces of iron atoms in Earth's liquid outer core become reverse-aligned, like tiny electromagnets located in the different direction from those around them.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

you'd use the equation that establishes a relationship between  energy  and  wavelength, which looks like this

e=h⋅cλ, where

λ  - the wavelength of the photon; c  - the speed of light, usually given as  3⋅108m/s; h  -  planck's constant, equal to  6.626⋅10−34j s

plug the value you were given for the energy of the photon in the above equation to get the wavelength

e=h⋅cλ⇒λ=h⋅ce

λ=6.626⋅10−34js⋅3⋅108ms−1.257⋅10−24j=1.581⋅10−1m