1. Measuring trees- height Estimating Height Height= Looking between legs to get 45 degrees Height= Measuring height using a pencil and a friend Height= Making a clinometer to measure 45 degrees Height=

2. Measuring trees- girth Measure the girth at breast height 1.3m Can measure hugs (approx 1.5m) Find the age by dividing girth by growth rate. An average of 2.5cm could be used. Type of treeAverage trunk growth rate (girth) per year (cms) Sycamore2.5 English Oak1.5 Cedar of Lebanon, London Plane, Douglas Fir 7 Scots Pine, Horse Chestnut, Common Lime 1 Yew0.7 Girth of tree (g)= Age of tree= (g)____ / 2.5=

3. Measuring trees- counting rings Each year a tree grows a new ring just beneath the bark. Each ring is made up of two bands: a light band (the quick growth of spring) a darker band (the slower growth of late summer) In warmer, wetter years, trees grow well so the ring will be thicker. In colder, drier years, trees do not grow so well so the ring will be thinner. What growth ring indicates fine growth weather that year?

4. Measuring trees- density The more air spaces the wood contains the lighter and less dense it is. The weight of the wood increases as density increases. Which tree has the densest wood? Wood that contains less air tends to be stronger than wood that contains lots of air. Using this information can you rank the cubes from weakest to strongest? Tree cubeDensity (Kg/m3)Strength (order) Oak725 Yew675 Scots Pine510 Ash530 Holm oak770 Sitka spruce440 Douglas Fir430 Beech725