ciencias

Solar energy

The sun, a source of energy.

Earth does not emit its own light. It comes from the sun. The sun is constantly producing energy. This energy travels through space and reaches earth as heat and light.

Heat: it travels to earth by means o radiation. The sun’s rays reach different places on earth at different angles, that’s why there are hotter and colder areas.

Perpendicular rays= hotter diagonally rays= colder

Light: is a form of energy. The light that comes from the sun looks white, but is made up of many colors.

Light propagates in straight line and all directions, light travels at great speed.

Some objects allow light to pass through them, transparent.

Some objects do not let light pass through them opaque.

Some objects only let part of the light pass through them translucent.

Reflection: it’s when light changes direction when it hits and objects.

Refraction: it’s when light changes direction when it passes from one substance to another.

Earth is a magnet

· Magnets: are objects that attract iron and steel. This force of attraction is called magnetism.

· Electromagnets: are artificial magnets. They need an electric current to work.

Earth’s magnetic field

Earth is a giant magnet. Like all magnets, it has two magnetic poles:

· Earth’s magnetic south pole is in northern Canada

· Earth’s magnetic north pole is near the Antarctic coast.