Which is capeble of housing astronaughts while they conduct reasearch

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

the answer is b ) square root of 5

asthenosphere and convection

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms