The Earth and it's Four 4 SubSystems.pptx

4 subsystem

1. The Earth and its System Prepared by: Angel Mae R. Alibangbang

2. Objectives At the end of the lesson, the students should be able to: Identify the different subsystems of the earth; Determine the characteristics of the each subsystem; and Explain the importance of studying the different subsystems of the earth

3. System - a set of interconnected components that are interacting to form a unified whole. 4 Subsystem Atmosphere Lithosphere Biosphere Hydrosphere

4. Atmosphere - is the thin gaseous layer that envelopes the lithosphere. - the present atmosphere is composed of 78% nitrogen (N), 21% oxygen (O2), 0.9% argon, and trace amount of other gases. -one of the most important processes by which the heat on the Earth's surface is redistributed is through atmospheric circulation.

5. Lithosphere - includes the rocks of the crust and mantle, the metallic liquid outer core, and the solid metallic inner core. - the Plate Tectonics is an important process in shaping the surface of the Earth. The primary driving mechanism is the Earth's internal heat, such as that in mantle convection

6. Biosphere - is the set of all life forms on Earth. - for the majority of life on Earth, the base of the food chain comprises photosynthetic organisms. During photosynthesis, CO2 is sequestered from the atmosphere, while oxygen is released as a byproduct. The biosphere is a CO2 sink, and therefore, an important part of the carbon cycle.

7. Hydrosphere - includes all water on Earth (including surface water and groundwater) about 70% of the Earth is covered with liquid water (hydrosphere) and much of it is in the form of ocean water. -only 3% of Earth's water is fresh: two-thirds are in the form of ice, and the remaining one-third is present in streams, lakes, and groundwater.

8. -the oceans are important sinks for CO2 through direct exchange with the atmosphere and indirectly through the weathering of rocks. -heat is absorbed and redistributed on the surface of the Earth through ocean circulation. Hydrosphere

9. The origin of the systems approach to the study of the Earth Friedrich Wilhelm Heinrich Alexander von Humboldt - He considered the universe as one interacting entity. Vladimir Vernadsky (1863-1945) - popularized the term “biosphere”

10. In the 1970s, the Gaia Hypothesis was jointly developed by James Lovelock, an English scientist/naturalist, and Lynn Margulis, an American microbiologist. - Gaia Hypothesis - the biosphere is a self regulating system that is capable of controlling its physical and chemical environment. In 1983, NASA advisory council established the Earth Systems Science Committee. The origin of the systems approach to the study of the Earth