Question

Which part of the earth do the suns direct rays hit during the summer solstice

Answer 1

The sun is at the solstices on roughly June 21 and December 21.

June 21 is the "Summer" solstice in the Northern hemisphere.
At that time, the sun is directly overhead at a point on the Tropic
of Cancer, about 23.5° North of the equator.

December 21 is the "Summer" solstice in the Southern hemisphere.
At that time, the sun is directly overhead at a point on the Tropic
of Capricorn, about 23.5° South of the equator.

Answer 2

The crust which is the outermost layer of the earth<span />