Within which of these layers does convection occur?
a. mantle and crust
b. inner core and crust
c. outer core and mantle
d. inner core and outer core

About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Chlorophyll a had the molecular formula c55h72mgn4o5 how many atoms are in this molecule