How do you think large populations affect the agriculture industry of the world today

For larger populations, you need more agriculture. Thefore, the agriculture industry has to work even harder to provide. 

Lager populations cause an increase in the amount of agriculture needed to satisfy the population. This also causes deforestation, which is destroying areas where crops were usually planted in order to make room for larger populations. This means the agriculture has to be grown in abundance and with less amount of land available.

Magma is outside the volcano  and lava is inside the volcano. 

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.