Science Riddles for Middle School Minds

I orbit the Sun once a year and wear blue and green. What am I?

I am two parts hydrogen and one part oxygen. What am I?

I am invisible and make balloons float. What am I?

I split white light into rainbow colors. What am I?

I pull apples down and hold planets in orbit. What am I?

I burn far away and twinkle at night. What am I?

I circle between Mars and Jupiter. What am I?

I am hottest though not closest to the Sun. What am I?

I protect your body and help you feel touch. What am I?

I carry oxygen like tiny red boats. What am I?

I take the shape of a container but keep volume. What am I?

I shake the ground and is measured by magnitude. What am I?

I study rocks and minerals. Who am I?

I contain protons, neutrons, and electrons. What am I?

I am the atom center where most mass lives. What am I?

I am the negatively charged particle. What am I?

I am a substance with only one kind of atom. What am I?

I am two or more atoms bonded together. What am I?

I rate acidity and bases from 0 to 14. What am I?

I am the energy of motion. What am I?

I am stored energy waiting to move. What am I?

I am the process plants use to make food. What am I?

I am the carrier of genetic instructions. What am I?

I am the layer of gases around Earth. What am I?

I am the movement of heat through fluids. What am I?

I am the boundary where plates meet. What am I?

I am the change from liquid to gas. What am I?

I am the variable kept the same. What am I?

I am the evidence collected in an experiment. What am I?

What has a nucleus, a membrane, and is the basic unit of life?