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MTEL Earth Science Test Answer Key
1. C: The steps in the scientific method are not necessarily used in exactly the same way in all sciences. Sometimes they happen at the same time or in a different order and may be repeated during the course of the study but should be applied with intelligence, imagination and creativity.
2. D: The ecosystem can remain fairly stable over long periods of time because of natural processes: the availability of food sources and appropriate shelter, the number of predators and/or parasites and the occurrence of natural disasters. Ecosystems are complex and subject to cyclical fluctuations and the appearance and disappearance of species.
3. A: Human activities have an enormous influence on the state and stability of the ecosystem and can alter its equilibrium for better or worse. As the guardians of the earth, it is our responsibility to ensure we respect the other species, protect the various components of the community and avoid damaging the delicate balance of the ecosystem through misuse of its natural resources.
4. C: Astronomy is one of the oldest sciences; man has been studying the sky since the beginning of time. It is divided into two areas. Observational astronomy collects and analyzes data. Theoretical astronomy develops analytical models to explain celestial objects and phenomena. The two often work together: theoretical explains observations and observations confirm theoretical results.
5. B: The earth sciences or geosciences study the earth, the only known life-baring planet. This field is concerned with the lithosphere, the hydrosphere and the atmosphere. These three working together create the conditions needed to sustain the biosphere, which is comprised of all living organisms.