a definite statement or claim
He made the assertion that it would not rain tomorrow.
climate
the type of weather that a country or region has
The climates of northern countries like northern Canada, northern Europe, and Mongolia are very cold.
confront
to deal with (a difficult situation); to face
Milady was terrified when Athos confronted her with her real name.
depletion
reduction in the amount of something due to overuse or damage
The group had to travel back to the river due to the depletion of their water supplies.
frequent
happening often
Recently, the doctor has been a frequent visitor to our home to treat my sick brother.
infrastructure
the basic facilities, services, and installations needed for a society to function
Rome’s agricultural production could not provide sufficient energy to maintain its infrastructure and the welfare of its citizens.
migrate
to move from one country or region to another
Some birds migrate south in winter.
rally
to join in support of
People will rally around the company.
reliable
able to be counted on or trusted to work or be accurate
I'm not sure that this information is reliable.
reliance
the state of being dependent on a person or thing
I have reliance in my parents.
scorching
very hot
The scorching heat of the sun made the trouble.
spark
to ignite; to start, usually from a small source or cause
However, the system sparked a heated controversy.
swamp
to cover or fill with water
The little boat was swamped by the waves.
vigorous
sound; sturdy or robust
We had a very vigorous debate.
vulnerable
being easily harmed, hurt, or wounded
They become more vulnerable.