Science Fair Help/Ideas
All living things inherit a set of characteristics or traits from their
parents. Members of any given species transfer traits from one
generation to the next. The passing of traits from parent to offspring
is called heredity and causes the offspring to resemble the parent.
Some traits differ among members of a population, and these variations
may help a particular species to survive better in a given environment
in getting food, finding shelter, protecting itself, and reproducing.
These variations give the individual a survival advantage over other
individuals of the same species.
The Earth’s surface is constantly changing. Some changes happen very
slowly over long periods of time, such as weathering, erosion, and
uplift. Other changes happen abruptly, such as landslides, volcanic
eruptions, and earthquakes. All around us, we see the visible
effects of the building up and breaking down of the Earth’s surface.
Magnetism and Electricity
Earth and some earth materials have
magnetic properties. Without touching them, a magnet attracts things
made of iron and either pushes or pulls on other magnets.
Electricity is a form of energy. Current electricity can be generated
and transmitted through pathways. Some materials are capable of
carrying electricity more effectively than other materials. Static
electricity is a result of objects being electrically charged.
Without touching them, materials that are electrically charged may
either push or pull other charged materials.
Matter and Chemistry
The weight of an object is always
equal to the sum of its parts, regardless of how it is assembled. In
a chemical reaction or physical change matter is neither created
nor destroyed. When two or more materials are combined, either a
chemical reaction or physical change may occur. Chemical reactions are
often indicated when materials give off heat or cool as they take in
heat, give off light, give off gas, or change colors. In a chemical
reaction, materials are changed into new substances. In a physical
change a new substance is not formed.