OTHERS.- HALLOWEEN

                   HALLOWEEN

I look for a page in Internet about Halloween and its manners. I put the link for if you want know more than Halloween. In this page there are videos, photos and information about witchs, ghost and more monters.

The link is : Click here

UNIT 2 : PLASTICS AND BUILDING MATERIALS

                       What is Slate?

Slate is a fine-grained, foliated metamorphic rock that is created by the alteration of shale or       mudstone by low-grade regional metamorphism. It is popular for a wide variety of uses such as roofing, flooring and flagging because of its durability and attractive appearance.

Composition of Slate

Slate is composed mainly of clay minerals or micas depending upon the degree of metamorphism to which it has been subjected. The original clay minerals in shale alter to micas with increasing levels of heat and pressure. Slate can also contain abundant quarz and small amounts of feldspar, calcite, pyrite, hematite and other minerals.

Color of Slate Most slates are gray in color and range in a continuum of shades from light to dark gray. Slate also occurs in shades of green, red, black, purple and brown. The  color of slate is often determined by the amount and type of iron and organic material  that are present in the rock. How Does Slate Form? The tectonic environment for producing slate is usually a former sedimentary  basin that becomes involved in a convergent plate boundary. Shales and  mudstones in that basin are compressed by horizontal forces with minor heating.  These forces and heat modify the clay minerals in the shale and mudstone. Foliation  develops at right angles to the compressive forces of the convergent plate boundary to yield a vertical foliation that usually crosses the bedding planes that existed in the shale. Uses of Slate Most of the slate mined throughout the world is used to produce roofing slates. Slate  performs well in this application because it can be cut into thin sheets, absorbs  minimal moisture and stands up well in contact with freezing water. A disadvantage  is the cost of the slate and its installation in comparison with other roofing materials.  As a result, in new construction slate is mainly confined to high end projects and  prestige architecture  . Slate is also used for interior flooring, exterior paving,  dimension stone and decorative aggregate. Small pieces of slate are also used to  make turkey calls. The photos and video on this page document several uses of slate. Historically slate has been used for chalkboards, student writing slates,  billiard tables, cemetery markers, whetstones and table tops. Because it is a good  electrical insulator it was also used for early electric panels and switch boxes.

UNIT 2 : PLASTICS AND BUILDING MATERIALS.

                    UNIT 4: EXERCICES 1, 2 AND 3.

                             
                                         If you want to see the exercices 1,2 and 3 ( unit 4), you must Click here

UNIT 2 : PLASTICS AND BUILDING MATERIALS

HERE IS A VIDEO ABOUT THE MANUFACTURE OF PLASTICS

ALEJANDRO FERNÁNDEZ

UNIT 2 : PLASTICS AND BUILDING MATERIALS

       - RECYCLE PROCESS

In this unit ,we study the recycle process. And I look for a video about the process. I think that this is a easy video for understand the recycle process.

 

                                                                                  MADE BY : Susana Ortega

UNIT 2 : PLASTICS AND BUILDING MATERIALS

                                                       

                              2.1.-Plastics.

                                        

  

                                                                                   Made by : Susana Ortega