The core of the Earth provides the heat that creates the convection
currents of the mantle and drives
the tectonic plates. Describe what
would happen as the Earth's core
cools down over billions of years?

In which reaction is precipitation occurring?

Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium

Which of the following will cause an increase in the acceleration of an object? increase force decrease force increase mass decrease mass