1 | P a g e EDA3046 Exam Prep - Past Exam and Assignment questions and answers. 1. Define the following concepts Alien species • Alien species refers to animal and plant species that are removed from their native environment and placed in a non-native or alien environment Biodiversity • It refers to all the variety of life that can be found on earth (plants, animals, fungi and micro-organisms) Deforestation • It can be described as the permanent destruction of indigenous forests and woodlands. Depletion of natural resources • Depletion of natural resources is when natural resources are consumed at a higher rate than what it is produced. This is caused due to over-cropping, over- grazing, wastage, urbanisation Desertification • Desertification is a type of land degradation in which a relatively dry region of land becomes increasingly arid, typically losing its water bodies, vegetation and wildlife. It is caused by droughts and erosion, over-cropping. Ecosystem • The ecosystem is all living things, from plants and animals to microscopic organisms, which share an environment Environmental education • Environmental education is the process of recognizing values and clarifying concepts in order to develop skills and attitudes necessary to understand and appreciate the interconnectedness of people, their cultures and their biophysical surroundings. • Environmental education also entails practice in decision-making and self-formulation of a code of behaviours about issues concerning environmental quality. Global warming • This refers to the gradual increase of the average air temperature in the earth’s lower atmosphere. Greenhouse Effect • This refers to the natural warming effect that certain gases have on the temperature of the earth’s atmosphere under normal conditions. Habitat • The natural home or environment of an animal, plant or other organism Health hazard • A chemical for which there is statistically significant evidence based on at least one study conducted in accordance with established scientific principles that acute or chronic health effects may occur in exposed employees.