Final answer:
The large desert areas in the southwestern United States are the Mojave Desert and the Sonoran Desert. These deserts are known for their arid climates and abundant plant life in certain areas, like Saguaro National Park.
Step-by-step explanation:
In the southwestern states, large desert areas include the Mojave Desert and the Sonoran Desert. Both of these deserts are in areas of the United States such as Texas, New Mexico, and Arizona that are characterized by arid climates and receive high amounts of sunlight throughout the year. Some desert-adapted plants thrive in these conditions, an example being the diverse ecosystems found in places like Saguaro National Park, Arizona, in contrast to the more desolate rocky deserts of other regions. The Sonoran Desert is known for its abundant plant life, which is supported by the unique climatic conditions of the region, including the pattern of rainfall and high temperatures that are typical of subtropical deserts.