The mass number of an element is equivalent to the number of Protons and Neutrons in the element. For example Oxygen has eight protons and neutrons, therefore its mass number is 16. You could also calculate this by simply rounding the atomic weight of the element to the nearest whole number. Oxygen's atomic weight is 15.994, which as you can see, would be rounded to 16 :)
Answer:
Independence from Spain, in the case of Central America, was primarily a reshuffling of power between Peninsulares (Spaniards born in Spain) and Criollos (Spaniards born in Latin America).
Solar power is not the best option in some countries because places like Rjukan (Norway) that do not recieve enough sunlight because of where they are located.
The correct answer is: <span>B) An Astronomical Unit
</span><span>If I managed to help you, please make sure to mark my answer as the "Brainliest" answer. Thanks! :)</span>
Answer:
The upper mantle and crust.