Which method was primarily used to establish the Geogolical Time Scale?

Nwhat way does renewable energy differ from nonrenewable energy?

Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain

Sink holes may eventually for to join a. wide valleys b. zone of aeration c. dripstones d. aquifer