2 What does the author describe in the passage?
A
the history of the Hoover Dam and its impachon the Southwest region
B
the development of different types of hydropower
C the political environment in America during the construction of the Hoover
Dam
improvements in irrigation along the Colorado River before the Hoover
Dam was built

What in scientific term why the salty popcorn causes this thirst

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called

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.