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Earth System Science - Contenido educativo

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Subido el 28 de mayo de 2007 por EducaMadrid

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NASA Connect segment explaining Earth System Science. The video also explores how modern technology studies the many different areas of Earth System Science.

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To learn more about Earth System Science, and how NASA studies the Earth, 00:00:00
let's go visit with Dr. Melody Ann Avery from NASA Langley Research Center. 00:00:04
Earth System Science is an integration of many scientific disciplines, 00:00:09
including geology, biology, chemistry, physics, oceanography, meteorology, 00:00:14
computer science, and all other sciences that study life and the Earth. 00:00:21
NASA scientists use modern technologies to measure key features of our planet, 00:00:27
such as concentrations of gases in the atmosphere, 00:00:33
and the temperature of the ocean in many locations. 00:00:36
Satellites orbiting our planet provide enormous amounts of data 00:00:40
that scientists use to try to understand how our planet works 00:00:44
and the changes that are happening. 00:00:48
You know, Earth science, long perceived as a minor field 00:00:51
compared to biology and the physical sciences, 00:00:55
is now emerging as an important field because of the new ability of humans 00:00:58
to change the balance of the Earth system. 00:01:03
And students, with Earth System Science, you have greater opportunities 00:01:06
to learn through inquiry, exploration, and discovery, 00:01:11
aided by the expanded use of the Internet and visualization technology. 00:01:15
I think it is fair to say that our quality of life depends on the quality of our Earth scientists 00:01:21
and on the quality of our citizens' knowledge about the Earth system. 00:01:27
This is because understanding the land, air, water, and life of our planet 00:01:32
gives us the knowledge to best manage the world around us. 00:01:39
For the first time in history, we can dramatically change the way the planet works as a whole. 00:01:43
Here are a few questions for you to think about. 00:01:50
How can we change the way the planet works as a whole? 00:01:53
What technologies have humans developed to make that change possible? 00:01:57
Well, there are so many people living on the planet, 00:02:02
and each person needs energy like food, water, heating, and transportation. 00:02:06
All of this energy, if used carelessly, can change the Earth's climate, 00:02:12
deplete its ozone shield, 00:02:18
and dramatically alter the number and kinds of other organisms that share our planet. 00:02:20
Students, let's take a look back at one of the questions that Jennifer posed to you earlier in the show. 00:02:25
What do you think are the parts of the Earth system? 00:02:31
Everything in Earth's system can be placed into one of four major subsystems, 00:02:34
land, air, water, and life. 00:02:40
We call these four subsystems spheres. 00:02:45
Specifically, they are the lithosphere, or land, 00:02:48
atmosphere, or air, 00:02:52
hydrosphere, or water, 00:02:54
and biosphere, or life. 00:02:56
Let's learn a little bit about each sphere. 00:02:59
Suppose you were to slice the Earth in half and view its different layers. 00:03:02
What would it look like? 00:03:07
The lithosphere, sometimes called the geosphere, 00:03:09
contains the hard, solid land of the planet's surface, called the crust, 00:03:13
the semi-solid layer underneath the crust, called the mantle, 00:03:17
the liquid layer near the center of the planet, called the outer core, 00:03:22
and a solid, dense center called the inner core. 00:03:26
The crust is very uneven. 00:03:29
There are high mountain ranges like the Rockies and Andes, shown in red. 00:03:32
Huge plains or flat areas like those in Texas, Iowa, and Brazil, shown in green, 00:03:36
and deep valleys along the ocean floor, shown in blue. 00:03:43
The atmosphere contains all the air in our system. 00:03:47
It extends from the planet's surface to more than 100 kilometers above the planet's surface. 00:03:51
The atmosphere itself is composed of a number of layers. 00:03:57
The middle portion of the atmosphere, the stratosphere, 00:04:01
protects the organisms of the biosphere from the sun's ultraviolet radiation. 00:04:05
When air temperature in the lower part of the atmosphere, the troposphere, changes, weather occurs. 00:04:10
As air in the lower atmosphere is heated or cooled, it moves around the planet. 00:04:17
The result can be as simple as a breeze or as complex as a tornado or hurricane. 00:04:22
The hydrosphere contains all the solid, liquid, and gaseous water of the planet. 00:04:29
The hydrosphere extends from Earth's surface downward several kilometers into the lithosphere, 00:04:35
and upward about 12 kilometers into the atmosphere. 00:04:41
Solid or frozen water can be found in the form of glaciers, ice caps, and icebergs. 00:04:45
This is also called the cryosphere. 00:04:51
Liquid water can be found in the form of oceans, rivers, lakes, streams, 00:04:54
and groundwater beneath the Earth's surface. 00:05:00
Gaseous water, water vapor, can be found in the atmosphere 00:05:03
and also inside your lungs where it is key to life. 00:05:08
The final sphere, the biosphere, contains all the planet's living things. 00:05:12
This sphere includes all of the microorganisms, plants, and animals of Earth. 00:05:18
Within the biosphere, living things form ecological communities based on physical surroundings of an area. 00:05:24
These communities are referred to as biomes. 00:05:32
Deserts, grasslands, and tropical rainforests are three of the many biomes that exist within the biosphere. 00:05:36
Can you determine what biome you live in? 00:05:43
Now it is time for you and your teacher to discuss Jennifer's second question. 00:05:46
How do the parts of the Earth system you identified work together to make Earth function as a whole? 00:05:51
Also, now that you've compared your parts list with NASA's list, 00:05:57
how does each sphere work together to make Earth function as a whole? 00:06:02
This is a great time to pause the program and discuss these questions with your peers or teacher. 00:06:06
Students, remember there is one last question that Jennifer would like for you to discuss with your teacher, 00:06:13
and that is, how is the Earth system itself part of larger systems? 00:06:19
But before you discuss that question, let's send it back to Jennifer. 00:06:25
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Idioma/s:
en
Materias:
Matemáticas
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
NASA LaRC Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
287
Fecha:
28 de mayo de 2007 - 16:52
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
06′ 31″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
39.23 MBytes

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