Mercury may have lost part of its mantle and crust to a leaving it with a large, metal .

volcano, crust

giant impact, mantle

explosion, surface

giant impact, core

Giant impact and metalcore.

Explanation :

Mercury has a large core of liquid metal. The metal core is of iron metal.The core is surrounded by a mantle which is made up of silica and a solid outer crust.In the case of Mercury, the total core percentage is 42% of the planet while the Earth's core is only 17% of the planet.Mercury has lost part of its mantle and crust that left the mercury with a large metal core.

m=9

step-by-step explanation:

7m+8=71 subtract   8 from 71 which is 63 than divide it by 7m   equal 9.