| Galaxy |
|
Millions
of stars grouped together |
| Gamete |
gam-meet |
Scientific
word for sex cell. |
| Gas |
|
See
natural gas |
| Gas |
|
Something
made of particles that are very spread out and have no bonds between
them. |
| Generate |
|
Make
electricity by turning a magnet inside coils of wire. |
| Generator |
|
Large
coil of wire with a magnet inside. When the magnet is turned, electricity
is produced in the coil of wire. |
| Geothermal
power |
gee-O-therm-al |
Making
electricity using heat from hot rocks underground. |
| Germination |
germ-in-ay-shun |
When
a seed first starts to grow. |
| Glands |
|
The
glands in the male reproductive system add a special liquid to the
sperm cells to make semen. There are other sorts of glands in the
body. |
| Global
warming |
|
Another
term for 'greenhouse effect'. |
| Gram |
|
A
unit for measuring mass (g). |
| Gravitational
potential energy |
grav-it-ay-shon-al |
The
kind of energy stored by anything that can fall to the ground. |
| Gravity |
|
The
force of attraction between any two objects. The Earth is very big
and so has a large gravity pulling everything down towards it. |
| Greenhouse
effect |
|
When
the Earth warms up more than it should. It is caused by certain gases
(e.g. carbon dioxide) keeping heat in the Earth's atmosphere. |
