classifications of environment

Classification of environment:
Natural environment:
All living and non living things that occur naturally on The earth and the conditions of whether and climate.
Physical environment:
Physical environment describes the stuff the earth is made from and how it behaves aganiag and in favour of human activity it includes complete ecological units that function as natural system without massive human intervention including all flora funa soil rocks atmosphere and natural phenomena that occur with in THIER  boundaries.
Flora:
All the plant life an particular region or period or 
The complete system of vegetables species growing without cultivation in a given locality region or period.
Types of flora:
Forest: A forests is an area with a high density of trees. There are many definition of a forest based on the various criteria. Forests cover approximately 9.4% of the earth surface or 30% of total land area though once covered much more about 50% of the total land area.
Grassland:
Grassland are areas where the vegetation is dominated by grasses and other herbaceous non woody plants. Grassland occur naturally on all continent expect Antarctica.!!!!