vocabulary 7

State of Matter: any of the forms matter can exist in.

melting point: the temperature at wich a solid changes state into a liquid.

boiling point: the temperature at wich a liquid changes state into a gas.

freezing point: the temperature at wich a liquid changes state into a solid.

vocabulary 6

element: a basic building block of matter; a pure substance that cannot be broken down into anything simpler.

compound: a chemical  combination of two or more elements into a single substance.

atom: the smallest unit of an element that still has the properties of the elements.

proton: a particle with a positive charge in the nucleus of an atom.

neutron: an uncharged particle in the nucleus of an atom.

electron: a particle with a negative charge moving around the nucleus of an atom.

nucleus: the dense center part of an atom.

molecule: a group of more than one atom joined together that acts like a single particle.

Vocabulary 4

Electromagnetism: the production of magnetism by electricity by magnets.

Electromagnetic spectrum: all the wavelengths of visible and invisible light in order from short (gamma rays) to long (radio).

Laser: a device that produces a thin stream of light of just a few close wavelengths.

Type of Pollution in my Neighborhood

Water Pollution 

Is the contamination of water bodies, it can produce serious problems in the place were you live and it is bad for our health.

Problem

In our country there are many communities with drinking water shortages, while else where it is lost as in this area of San Antonio where there is a broken water pipe for over a year.
This current of water passing outside my house every day a great quantity of waste wich is easy to form a way mosquito breeding sites and for that we must sweep the rubbish daily.

                                             

Solution

The authorities responsable for this problem should send a staff to the townships to see

where water leaks and repair this lost that can benefit others.

vocabulary 14

rock:a naturally formed solid in the crust, made up of one or more minerals.

igneus rock: a rock formed when melted rock material cools and hardness.

Sedimentary:rock:a rock made of bits of matter joined together.

fossil:any remains or imprint of living things of the past.

metamorphic rock:a rock formed  under heat and pressure.

humus: decayed plant or animal material in soil.

pollution: adding any harmful substances to Earth's land, water, or air.

rock cycle:rocks changing from one form into another in a never ending series of process.

Vocabulary 13

mineral:a  solid material of Earth´s crust with a definite composition.

Luster: the way light bounces off mineral´s surface.

streak:the color of the powder left when a mineral is rubbed against a hard,rough surface.

hardness:how well a mineral resists scratching

cleavage: the tendency of a mineral to break along flat surfaces.

ore:a mineral containing a usefull substance.

gem:a mineral valued for being rare and beautiful.

nonrenewable resource: a resource that cannot be replaced within a short period of time or at all.

Examples of change of gravity on Earth

Coconuts falling for the gravity

Soil falling cause of the force of gravity

                                   A waterfall                                 

         dropping an objet are ocurring change of gravity on Earth.

And many other examples.