1. Rocks near mid-ocean ridge were younger than rock near trenches.
2. Matching bands of magnetic rocks were found on either side the mid-ocean ridge; record changes in earth's magnetic field over a period of time.
3. E<span>arthquake data showed oceanic crust is sinking on to the mantle at the trenches.</span>
150÷3=50
350÷4=87.5
(50+87.5)÷2
137.5÷2
=68.75
Explanation:
tala it is also called myopia lekhnu hai
Äni Arko MA it is also called hypermetropia .
Number of neutrons = mass number - atomic number
= 15 - 9
= 6