Scientists think that the , made of liquid iron and nickel, moves to produce Earth’s magnetic field. a.
crust
b.
mantle
c.
outer core
d.
inner core

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.