Biology
Chemistry
Physics
Earth & Environmental
Scientists
100

The basic unit of life.

Cell

100

The chemical formula for table salt.

NaCl

100

The force that acts on objects in free fall.

Gravity

100

The phenomenon caused by the trapping of heat in Earth's atmosphere by greenhouse gases.

The greenhouse effect

100

This scientist developed the theory of evolution by natural selection.

Charles Darwin

200

The theory that species evolve over time through natural selection.

Evolution

200

The pH level of a neutral solution.

7

200

The device used to measure electric voltage.

Voltmeter

200

The largest ocean on Earth.

The Pacific Ocean

200

The scientist who formulated the laws of motion and universal gravitation.

Isaac Newton

300

This process converts sunlight into chemical energy in plants.

Photosynthesis

300

This element is the main component of steel.

Iron

300

This is the force that opposes the motion of objects through the air

Air resistance

300

The process by which water vapor turns into liquid water.

Condensation

300

This scientist developed the theory of general relativity

Albert Einstein

400

The molecule that carries genetic information.

DNA

400

The number of valence electrons in a carbon atom.

4

400

This is the rate of change of velocity of an object.

Acceleration

400

The layer of Earth located between the crust and the core.

The mantle

400

Who created the periodic table?

Dmitri Mendeleev

500

The type of cell division that results in two daughter cells with the same number of chromosomes as the parent cell.

Mitosis

500

This type of bond involves the sharing of electron pairs between atoms.

Covalent bond

500

The type of energy in the heating of soup or melting of ice cream.

Thermal

500

The scale used to measure the magnitude of earthquakes.

The Richter scale

500

This scientist is famous for her research on radioactivity and was the first woman to win a Nobel Prize.

Marie Curie