Which of the following cycles is the most important for life? A) the nitrogen cycle
B) the oxygen cycle
C) the water cycle
D) carbon cycle
E) all are important for life

The most effective way to provide children with safety messages is to

Organize the following objects from lowest volume to highest volume

The table below shows the elements that mainly comprise each of the four layers of earth: elements in layers layer main elements crust oxygen, silicon mantle iron, magnesium outer core iron, nickel inner core iron which of these elements make up the layer that is 0.2 to 1.1 percent of earth's total diameter?