Southwest region is defined as extending from the California coast to far eastern Texas.
Explanation:
Southwestern is an informal name to the region of western United nations. Geographically this region is made of Mojave, Sonoran, and Chihuahuan Deserts, that great feature of the deserts.
The two rivers of this region are colorado and Rio grande running on the eat north and south formed approx 8000 years ago.
Most of the vegetation in this region is bush ad cactus. landscapes of this region include canyons, mesas, buttes, basin along with ranges.
This region has an extremely diverse population of birds like a barn owl and red-tailed hawk. The southwest part contained many national parks and monument valleys.
Tectonic setting of the San Andreas Fault (transform plate boundary) in California, the subduction zone (convergent plate boundary: oceanic-continental collision) in the Pacific Northwest.
<u>Instead of Helium and Hydrogen there are heavier elements in inner planets like Nitrogen and oxygen.</u>
Explanation:
As the inner planets like Mercury, Venus and Mars and earth have a solid surface which is separated by the Sharpe atmosphere, and their gravity is too low to hold these light gases.
Uranus is primarily composed of gases and ice of which 83% is hydrogen and 15% helium and rest are trace gases. As in the early composition of the atmosphere, the inner planets like the earth had a solid atmosphere composed of solid silicates elements like magnesium, iron, calcium, and potassium.
As the earth has a highly unstable atmosphere only carbon, nitrogen and oxygen combined in lightning occur. And planet mercury has no atmosphere thus gravity is too low to hold any gas.
