the correct answer is - 1 cm/yr.
alongside the western coast of south america, the nazca plate and the south american plate are in a collision for several million years now, with the nazca plate being the one that is subducting in this convergent plate boundary.
if the nazca plate's focus has moved 1,000 km in the last 10 million years, than in order to get to the annual movement of the subduction we need to convert the km into cm first:
1 km = 10,000 cm
1,000 x 10,000 = 10,000,000
1,000 km = 10,000,000 cm
than we need to divide the number of cm with the number of years:
10,000,000 / 10,000,000 = 1
and we get the result of 1 cm/yr.
the first blank can be filled with option b, that is, radiant energy, and the second blank can be filled with option c, that is, the sun.
radiant energy is most generally applied in the fields of solar energy, radiometry, lighting, and heating, however, is also in certain cases used in other branches like telecommunications. in modern uses, comprising the transmission of power from one location to another, radiant energy is also used to signify towards the electromagnetic waves. thus, it is the form of energy that can move from place to place across the universe.
a surface heated by the sun transforms the energy of the light into infrared energy, that is, a form of radiant energy, thus, the main source of radiant energy on earth is the sun.
hmmmmmm let me think