Final answer:
The last ice age saw Canada and much of the northern United States covered in thick ice sheets. The glaciers shaped the land by removing soil and creating new topographical features like Cape Cod. Options A and C are not explicitly supported by the information provided.
Step-by-step explanation:
The last ice age had a vast impact on North America, leading to several significant geographical and climate changes across the continent. Here's a look at those provided options, with explanations based on our understanding:
- B. Canada was covered with ice thousands of feet thick: This is accurate. During the last glaciation, ice sheets, sometimes two miles thick, extended over much of present-day Canada and the northern United States.
- D. Much of the northern United States was ice covered: This is also true. The glaciers reached into the northern United States and shaped the land by removing soil and depositing a variety of geological materials upon which new soil could develop. Landforms like Cape Cod are remnants of this glacial activity.
The other two options are not explicitly supported by the data provided:
- A. The southwest was covered with sand dunes - This option is not confirmed by the data provided.
- C. Florida received heavy rains - While climate patterns were different during the ice age, specific details about rains in Florida are not given in our sources.