U-shaped mountain valleys that may contain rocks that have been polished or appear to have near parallel scratches on the surface are most likely formed by:

Explain the value of statistics and other data to positive economics and to normative economics

What is one difference between austria and switzerland? a. austria is landlocked. b. austria has more minerals resources c. austria has a strong tourism industry d. austria has a strong dairy cattle industry

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.