Adepression on the surface of the land caused by the collapse of a cave roof is a blank. a) valley b) sinkhole c) mound

Which of the following factors is not used to measure a country’s standard of living? a.) life expectancy b.)educational levels c.)divorce rates d.) gross income

An earthquake’s epicenter can be determined from arrival time data recorded on a(

What is the famous rainforest in costa rica called?