The Effect of Environmental Factors on Wood Decay
The hypothesis that the wood immersed in the soil will start to decay and become weaker at a faster rate is proven to be true.
Wood is used to build many structures and in the making of furniture. The application of wood in construction will depend on its properties, like strength and durability. Other factors may include the finishing and maintenance requirements. Paint and varnish coating help to give wood a pleasant appearance, and also make it last longer.
What would happen if the science fair project was conducted using other types of wood like Pine, Fir, Hemlock or Birch?
Try repeating the experiment, this time exposing the wood for different lengths of time (1 week, 2 weeks etc) in order to study the rate at which the wood will weaken.
Wood preservation - http://www.forestprod.org/cdromdemo/wp/wp4.html
About exposed wood - http://www.chemisys.com.au/cutek/exposedwood.htm
Basic safety requirements