Mountains were a barrier for settlers travelling in North America
The economy drastically slow downs as money loses its buying power
Answer:
4. The weight of the air above that location.
Explanation:
According to Hydrostatics, the pressure is directly proportional to fluid density, gravitational constant and height of the fluid column. That is to say:

Hence, the correct answer is option 4.
Answer:
2 .poor communication can chip away at self esteem and self confidence