Fill in the blanks with the correct answer.
The northern parts of North America are ............. than the southern parts.
The ................ cause rain throughout the year along the north – west coast in the northern part of North America.
The ................ warms the Alaskan Coast and keeps it frost-free in winter.
The tropical regions mainly experience rainfall in the .............. season.
The prairies are a vast stretch of ............ grasses.