The Trans-Pecos ecoregion occupies the westernmost portion of Texas. It includes the Chihuahuan Desert, the Guadalupe Mountains, the Davis Mountains, and Big Bend National Park. This ecoregion ranges in elevation from 2,500 ft. to 8,749 ft and receives on average less than 12 inches of rainfall a year, although this varies with elevation. Soils at the lowest elevations in this area are the result of after the erosion of the Guadalupe and Davis Mountains.
(A) disposition
(B) weathering
(C) flash floods
(D) river action

Which term best describes a community in which people work mostly in factories? a.agricultural. b.hunting and gathering. c.domesticated. industrial.

Which statements best describe the differences or similarities between a comparative investigation and an experimental investigation? check all that apply. experimental investigations are best for showing cause-and-effect relationships, while comparative investigations do not necessarily show this type of relationship. comparative investigations are often impractical and unrealistic, while experimental investigations are the most practical and realistic kinds of investigations. comparative investigations allow for the use of a wide range of variables but do not have a control group, while experimental investigations involve variables that can be controlled. both experimental investigations and comparative investigations are designed to answer scientific questions. both experimental investigations and comparative investigations focus on making observations rather than collecting new data.

What are some natural processes that represent physical and chemical changes?