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Science 10 Aim: Intro to Energy Flow in Global Systems
Science 10Aim: Intro to Energy Flow in Global Systems
AgendaGo over Unit test Intro to Energy Flow in Global Systems
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Defining SystemsSystem: The part of the universe you wish to study. Surroundings: Anything outside the system.
Types of SystemsIsolated System: Does not exchange any matter or energy with its surroundings
Example:- A good thermos
Types of Systems Closed System: Exchanges energy with its
surroundings, but not matter
Example: Chemical reaction that gives off heat in a stoppered flask.
Types of SystemsOpen System: Exchanges both matter and energy with its surroundings.
Example: heating up anOpen container of water.
The Biosphere (the living globe)
Our system of water, land and air
The Biosphere (the living globe)
The biosphere requires a constant supply
of energy to function.
The Biosphere (the living globe)
The sun delivers this energy daily.
The Biosphere (the living globe)
Consists of three components:
1) Atmosphere 2) Hydrosphere 3) Lithosphere
The Biosphere: Atmosphere A thin layer of well mixed gasses (mostly nitrogen (78%) and oxygen (21%)) surrounding the Earth.
Allows vital light rays to pass through to the Earth but shields us against lethal radiation.
The Biosphere: AtmosphereMost of the atmosphere is concentrated in the lower 2 layers: Troposphere: 0 – 12 km high Stratosphere: 13 – 50 km high,
Mesophere: 50 – 80 km high Thermosphere : 80km – 300 km
The Biosphere: Atmosphere O2 and O3 (ozone) in the outermost layers of the atmosphere absorb most of the harmful ultraviolet type radiation. Most of which is in the stratosphere.
Also burns most meteorites.
Hydrosphere: All of the Earth’s water (Includes water in the air and ground water).
The hydrologic cycle is the evaporation and condensation of the Earth’s water.
Water continuously cycles in and out of the atmosphere.
Clouds are water droplets found mostly in the troposphere
The Cryosphere consists of water that is temporarily frozen in polar ice caps, snow, permafrost, and glaciers.
Hydrosphere:
Lithosphere: All of the land (soil) Provides the water and minerals needed by plants to produce the food for all trophic levels.
Varies in thickness from 100 – 200 km thick.
