Which statement is true?

time zones are exactly 15° apart around earth.

time zone borders on land may curve to keep regions together.

there are 12 time zones around earth.

each country or nation has only one time zone.

Explain how a convection current in the earth is formed.

What are the similarities and differences in the way geologists and biologists approximate the age of the earth? justify your response in two or more complete sentences.

What is the general rule about surface currents? cold water flows along the ocean floor towards the equator. the east coasts of continents have cold surface currents, and the west coasts of continents have warm surface currents. seasonal and constant offshore winds create significant upwelling along the west coasts of south and north america and africa. the west coasts of continents have cold surface currents, and the east coasts of continents have warm surface currents.