The correct options are B AND D.
Agriculture was the major means of survival for men during the early days. Fluctuations in the rainfall during the course of a year may adversely affect the crops grown. If this persists for a long time it will leads to food shortage and famine.
Earthquake and eruption volcanoes are shift in the physical environment which can easily destroy any community.
The waning gibbous moon phase will be next.
Answer:
As you travel further from the Earth's surface, the atmosphere changes. The closer to the Earth's surface, the greater the weight (or force) of the atmosphere because air near the surface has ALL air above it pushing down on it. As an airplane travels higher into the atmosphere, air pressure decreases.
Explanation:
I THINK THE THE ANSWER SHOULD BE D