Researchers believe that an important factor contributing to the spread of pandemics around the world has been -

How are the high islands of the pacific formed? a. by connected coral reefs called atolls b. by lagoons c. by moving glaciers d. by underwater volcanoes

In the diagram below, ab and bc are tangent to o. what is the measure of

Which city area has the most accessible oil reserves a) caspian sea b) siberia c)arctic coast d)lake baikal