Science Crossword

1. The state of matter where the particles have the most energy.
3. An organelle which is the site of respiration.
5. The number of waves passing a given point in a second.
9. That force that pulls things to the centre of Earth (and other planets).
10. The process of introducing small quantities of dead or inactive forms of a pathogen into the body to stimulate the white blood cells to produce antibodies.
11. The rate at which energy is transferred, or at which work is done
12. The process used by plants and other organisms to convert light energy into chemical energy, which is stored in glucose.
14. A substance that releases heat energy when combusted with oxygen.
15. The force acting perpendicular to a surface, per unit area

2. The rate of change of velocity. It can be calculated from the gradient of a velocity-time graph.
4. An atom or molecule with an electric charge due to the loss or gain of electrons.
6. The organ responsible for cognitive functions.
7. The community of organisms (biotic) and non-living (abiotic) components of an area and their interactions.
8. The elements in Group 7 of the periodic table.
13. Atoms of the same element, with the same number of protons but different number of neutrons.