An astronomical unit (a. u.) is
the diameter of the sun
the distance from the sun to the edge of the solar system
the distance from the sun to the earth
the mass of the earth

Based on this map, which statement about africa’s economic activity is most accurate? a) coastal countries are all members of opec b) economic development is more common with opec nations c) coastal countries have more access to productive resources d) economic development is more common above the sahara desert

What processes does carbon cycle through the biosphere?

Choose the correct chronological or of the time periods