Which element makes up earth's atmosphere?

a. hydrogen

b. carbon

c. oxygen

d. nitrogen

Example of items that changed chemically

What happens to an earthquake's S-waves when they strike the core? A) They bounce off B) They are absorbed C) The change into P-waves D) They change into L-waves

Which statement about dwarf planets is true? a. pluto was the first dwarf planet to be discovered. b. all dwarf planets likely contain a mixture of rock and ice. c. dwarf planets lie beyond the outer planets

How long would it take a spaceship to travel one light year

Which term describes the forces acting on the car? A. inertial B. buoyant C. balanced D. unbalanced

Which of these could NOT be used to find the mechanical advantage of an inclined plane? A. input force B. output force C. percent efficiency D. length and height of inclined plane

What are the Rules of magnetism

Two spheres of the same radius, but of different masses, are both fully submerged in water. The lighter sphere is held below the water line by a rope anchored to the bottom of the container. The heavier sphere is suspended from a rope.

How does an increase in thermal energy affect molecules?

Which of the following is an example of applied research?