Innovations in farming techniques that led to great productivity.
1.- <em>Three Point Linkage</em>. Developed by Harry Ferguson, this invention raised or lowered the plough, depending on the depth farmers wanted to dig.
2.- <em>Genetical Modified Corps</em>. Scientist isolate genes with some desirable traits to improve the quality of the plant.
3.- <em>Fertiliser Deep Placement.</em> A new form of fertiliser that increased the Yields.
4.- <em>New Feeding Methods</em>. Blending different components of food to improve the quality of nutrition.
<span><span><span>The crust: low density silicate rock, 5-70 km thick. There are two distinct types of crust.<span><span>Continental crust is variable in thickness and composition. Thickness ranges from 5-70 km. The composition ranges from mafic to felsic.</span><span>Oceanic crust is uniform in thickness and composition. It is 5-6 km thick and is mafic in composition.</span><span>The differences in thickness and density between continental and oceanic are responsible for the existence of ocean basins due to isostatic balance as the crust floats on the more dense mantle.</span></span></span><span>The mantle: high density, ultramafic silicate rock which can flow when subjected to long duration stresses. The mantle is over 2900 km thick and makes up over 80% of the volume of the Earth. The mantle is not molten!</span></span><span>The core: iron and nickel, liquid outer region with a solid center. The core is just over half the diameter of the Earth.</span></span>
