Changes in matter.

There are two kinds of changes in matter:

- Physical changes.
- Chemical changes.

Physical changes: The matter is the same before and after the change. There is a change in physical properties ( size, smell or colour).

Chemical changes: a material or substance is changed into another one. The change is not reversible, the material or substance is different after this type of change.

Natural materials Vs. man-made materials.

Natural materials

They are found around us.
We have to take them from the living things or extract them from the ground (Minerals).

Man-made materials

We transform natural materials in many different ways, making them man-made materials. This process changes the properties of materials.

Salamanca's weather forecast

There is a mistake in this weather forecast for our city; comment on this post discovering this serious mistake and get a chocolate bar.
For further information or get your prize, speak to David Sánchez, 3rd A Primary education classroom. Good luck and comment on the post!!

10 Day Forecast for Salamanca, NY (14779)

			High / Low (°F)	Precip. %
Today Sep 27		Mostly Sunny	64°/45°	10 %
Fri Sep 28		AM Showers	62°/43°	30 %
Sat Sep 29		Partly Cloudy	61°/43°	10 %
Sun Sep 30		Showers	58°/44°	50 %
Mon Oct 01		Partly Cloudy	61°/44°	10 %
Tue Oct 02		Partly Cloudy	66°/46°	10 %
Wed Oct 03		Sunny	71°/48°	0 %
Thu Oct 04		Partly Cloudy	68°/46°	10 %
Fri Oct 05		Sunny	65°/44°	10 %
Sat Oct 06		Mostly Sunny	62°/40°	10 %
Last Updated Sep 27 06:10 a.m. ET

More information about the atmosphere!!

Click on the picture to discover a new interesting web site:

Where is the stratosphere?

Follow the link to learn the layers of the atmosphere with this song.

Layers of the atmosphere.

-Troposphere: the weather occurs.
-Stratosphere: aeroplanes fly.
-Mesosphere: the coldest layer.
-Thermosphere: astronauts orbit the Earth.
-Exosphere: atoms and molecules escape into space.



 

The air.

The air main components are: nitrogen and oxygen.

NB "other gases" includes carbon dioxide (0.03 %) and small
prportions of other gases icluding argon and water vapour.