Group 4’sGroup 4’s

Metal and wood presentationMetal and wood presentation

The uses of metal in the pastThe uses of metal in the past

The first kind of metal that humans used was gold which The first kind of metal that humans used was gold which could be found native at that time. Small amounts of could be found native at that time. Small amounts of natural gold have been found in Spanish caves used natural gold have been found in Spanish caves used during the late during the late Paleolithic period, period, c.c. 40,000 BC. 40,000 BC.

Silver, copper, tin and meteoric iron can also be found Silver, copper, tin and meteoric iron can also be found native, allowing a limited amount of metalworking in early native, allowing a limited amount of metalworking in early cultures.cultures.

Egyptian weapons made from meteoric iron in about 3000 Egyptian weapons made from meteoric iron in about 3000 B.C. were highly prized as "Daggers from Heaven". B.C. were highly prized as "Daggers from Heaven". However, by learning to get copper and tin by heating However, by learning to get copper and tin by heating rocks and combining copper and tin to make an alloy called rocks and combining copper and tin to make an alloy called bronze, the technology of metallurgy began about 3500 bronze, the technology of metallurgy began about 3500 B.C. with the Bronze Age. B.C. with the Bronze Age.

The common properties of metalThe common properties of metal

The common properties of metal are:The common properties of metal are:They are hard and strong.They are hard and strong.They are solids at room temperature (except They are solids at room temperature (except

mercury).mercury).They are shiny when cleaned.They are shiny when cleaned.They are good heat conductors.They are good heat conductors.They have high melting points.They have high melting points.

The common properties of woodThe common properties of wood

The common properties of wood are:The common properties of wood are:They are inflexible.They are inflexible.They float on water.They float on water.They are not hard.They are not hard.They are strong and springy.They are strong and springy.They can be cut, shaped, carved and coloured.They can be cut, shaped, carved and coloured.They are warm to the touch.They are warm to the touch.

The uses of wood in the pastThe uses of wood in the past

The uses of wood in the past are:The uses of wood in the past are:to make buckets, wheels, plough and toolsto make buckets, wheels, plough and toolsto burn wood to keep warm, cook their food and to burn wood to keep warm, cook their food and

to scare away wild animals at night.to scare away wild animals at night.To build shelters.To build shelters.To make small boats like canoes.To make small boats like canoes.To make paper.To make paper.

Sources:Sources:

Matthew Cole, 2008, Science Diversity, Singapore Matthew Cole, 2008, Science Diversity, Singapore Pearson LongmanPearson Longman

Ho Peck Leng, 2008, I-science Diversity, Ho Peck Leng, 2008, I-science Diversity, Singapore EPB Pan PacificSingapore EPB Pan Pacific

Kate Bedford, 2005, Our World Wood, Great Kate Bedford, 2005, Our World Wood, Great Britain Aladdin Books Ltd.Britain Aladdin Books Ltd.