Answer:
I think its d.
Explanation:
cause all of the above they were found near river valleys
Owning a property to rent out
Answer:
I would say, B. Periodical episodes of intense dread accompanied by frightening physical sensations.
Explanation:
An air mass is a large body of air with generally uniform temperature and humidity. The area over which an air mass originates is what provides it's characteristics. The longer the air mass stays over its source region, the more likely it will acquire the properties of the surface below. As such, air masses are associated with high pressure systems.