Earth, continental drift, plate tectonics, sea floor spreading
... crust - the rigid, rocky outer surface of the Earth, The crust is composed of two rocks. The continental crust is mostly granite. The oceanic crust is basalt. Basalt is much denser than the granite. Because of this the less dense continents ride on the denser oceanic plates. ...
... crust - the rigid, rocky outer surface of the Earth, The crust is composed of two rocks. The continental crust is mostly granite. The oceanic crust is basalt. Basalt is much denser than the granite. Because of this the less dense continents ride on the denser oceanic plates. ...
Geologic Time - Kean University
... The eye of the trilobite tells us that the sun shone on the old beach where he lived; for there is nothing in nature without a purpose, and when so complicated an organ was made to receive the light, there must have been light to enter it. Louis Agassiz ...
... The eye of the trilobite tells us that the sun shone on the old beach where he lived; for there is nothing in nature without a purpose, and when so complicated an organ was made to receive the light, there must have been light to enter it. Louis Agassiz ...
Continental Drift and Plate Tectonics
... describe mantle heat flow in terms of convection. Deep materials, hotter than their surroundings (and hence buoyant), would tend to flow upward. In approaching the cool surface of the Earth, the material would lose its thermal energy, cool and sink, having lost buoyancy. The motion of mantle materia ...
... describe mantle heat flow in terms of convection. Deep materials, hotter than their surroundings (and hence buoyant), would tend to flow upward. In approaching the cool surface of the Earth, the material would lose its thermal energy, cool and sink, having lost buoyancy. The motion of mantle materia ...
Exam1B
... a) frictional heating as one plate slides by another b) increased pressure inevitably leads to melting of the subducting plate c) water released from the subducting plate lowers the melting point of the overlying mantle d) increased temperature leads to melting of the subducting plate 7. How does ma ...
... a) frictional heating as one plate slides by another b) increased pressure inevitably leads to melting of the subducting plate c) water released from the subducting plate lowers the melting point of the overlying mantle d) increased temperature leads to melting of the subducting plate 7. How does ma ...
the earth´s relief - Junta de Andalucía
... THE EARTH´S RELIEF Summary 1. Inside Earth The Earth is made of many different and distinct layers. The deeper layers are composed of heavier materials, they are hotter, denser and under much greater pressure than the outer layers. ...
... THE EARTH´S RELIEF Summary 1. Inside Earth The Earth is made of many different and distinct layers. The deeper layers are composed of heavier materials, they are hotter, denser and under much greater pressure than the outer layers. ...
EARTH AND SPACE SCIENCE
... Cratons are large areas of stable rock older than 540 million years that exist on all continents today. Cratons that have been exposed at the Earth’s surface are called shields. Cratons are the cores around which the modern continents are formed. Rifting is the process by which Earth’s crust breaks ...
... Cratons are large areas of stable rock older than 540 million years that exist on all continents today. Cratons that have been exposed at the Earth’s surface are called shields. Cratons are the cores around which the modern continents are formed. Rifting is the process by which Earth’s crust breaks ...
geotime - Valhalla High School
... Who’s got the TIME? • RELATIVE: order/sequence known, but not the actual date of occurrence. • ABSOLUTE: actual date known. If 2 dates are known, then the RATE OF CHANGE can be known- such as Mountain Building. ...
... Who’s got the TIME? • RELATIVE: order/sequence known, but not the actual date of occurrence. • ABSOLUTE: actual date known. If 2 dates are known, then the RATE OF CHANGE can be known- such as Mountain Building. ...
Earth as a System Section 2 Humans and the
... • When Earth formed about 4.6 billion years ago, its interior was heated by radioactive decay and gravitational contraction. • The decay of radioactive atoms still generates enough heat to keep Earth’s interior hot. Earth’ interior also retains much of the energy from the planet’s formation. • By th ...
... • When Earth formed about 4.6 billion years ago, its interior was heated by radioactive decay and gravitational contraction. • The decay of radioactive atoms still generates enough heat to keep Earth’s interior hot. Earth’ interior also retains much of the energy from the planet’s formation. • By th ...
The Third Planet
... thrown out by the collision accreted to form the Moon. Since the surface layers of the Earth are more abundant in the lighter elements, the composition of Moon would be more like the surface of the Earth (which it is). Our current view of the Moon’s structure and evolution is based on numerous obser ...
... thrown out by the collision accreted to form the Moon. Since the surface layers of the Earth are more abundant in the lighter elements, the composition of Moon would be more like the surface of the Earth (which it is). Our current view of the Moon’s structure and evolution is based on numerous obser ...
Chapter 20 - "Inside the Earth"
... on the seafloor. As each new section of seafloor forms at the ridge, iron minerals become magnetized in a direction that depends on the orientation of the earth's field at that time. This makes a permanent record of reversals of the earth's magnetic field. ...
... on the seafloor. As each new section of seafloor forms at the ridge, iron minerals become magnetized in a direction that depends on the orientation of the earth's field at that time. This makes a permanent record of reversals of the earth's magnetic field. ...
Why is the Earth Moving?
... https://www.youtube.com/watch?v=Kpoko_l34ZE (1:06) ‘The Earth 3D: Convection Currents and Tectonic Plates’ ...
... https://www.youtube.com/watch?v=Kpoko_l34ZE (1:06) ‘The Earth 3D: Convection Currents and Tectonic Plates’ ...
Understanding Geologic Time: Focus Questions
... 2. What can radiometric dating tell us about the age of rocks that the Law of Superposition cannot? ...
... 2. What can radiometric dating tell us about the age of rocks that the Law of Superposition cannot? ...
Joyce - NSERC-CMIC Footprints
... fault structures that exhibit a history of significant hydrothermal alteration. The Millennium and McArthur River deposits, which lie within the CMIC Footprints Project U site area, are surrounded by extensive illite alteration within the Athabasca Group sandstone and underlying basement complexes. ...
... fault structures that exhibit a history of significant hydrothermal alteration. The Millennium and McArthur River deposits, which lie within the CMIC Footprints Project U site area, are surrounded by extensive illite alteration within the Athabasca Group sandstone and underlying basement complexes. ...
Earth Science
... Igneous rocks have been found on all the continents. Similar fossils have been found in parts of Africa and South America. Australia has marsupial species that are not found on other continents. Indications of sea level changes have been recorded on all the contin ...
... Igneous rocks have been found on all the continents. Similar fossils have been found in parts of Africa and South America. Australia has marsupial species that are not found on other continents. Indications of sea level changes have been recorded on all the contin ...
Space Camp - Georgia Standards
... a. Observe and explain how parts are related to other parts in systems such as weather systems, solar systems, and ocean systems including how the output from one part of a system (in the form of material, energy, or information) can become the input to other parts. (For example: El Nino’s effect on ...
... a. Observe and explain how parts are related to other parts in systems such as weather systems, solar systems, and ocean systems including how the output from one part of a system (in the form of material, energy, or information) can become the input to other parts. (For example: El Nino’s effect on ...
From the moment that the Earth`s surface divided into plates, large
... The sandstone of the Nubbins, known as the Bromsgrove Sandstone Formation, was laid down in the Budleighensis river system. Material transported by the river built up layer after layer of sand, added to by wind-blown material from the immediate surroundings. The layers of sandstone in the Nubbins ex ...
... The sandstone of the Nubbins, known as the Bromsgrove Sandstone Formation, was laid down in the Budleighensis river system. Material transported by the river built up layer after layer of sand, added to by wind-blown material from the immediate surroundings. The layers of sandstone in the Nubbins ex ...
File
... • Less weight is exerted on the outer core, the pressure is less there, so iron and nickel present here in liquid state. • The molten outer core flows at the very slow rate which means electrons from the metals produce an electrical current. • This electrical current powers the earth’s magnetic fiel ...
... • Less weight is exerted on the outer core, the pressure is less there, so iron and nickel present here in liquid state. • The molten outer core flows at the very slow rate which means electrons from the metals produce an electrical current. • This electrical current powers the earth’s magnetic fiel ...
4. Seafloor Spreading Notes
... • Earth’s magnetic field has reversed many times since its creation ...
... • Earth’s magnetic field has reversed many times since its creation ...
Section 1: Earth: A Unique Planet
... as it moves through the ecosystem. • Producers form the base of the pyramid. Consumers that eat the producers are the next level of the pyramid. Animals that eat those consumers form the upper levels of the pyramid. • As you move up the pyramid, more energy is lost at each level. Therefore, the leas ...
... as it moves through the ecosystem. • Producers form the base of the pyramid. Consumers that eat the producers are the next level of the pyramid. Animals that eat those consumers form the upper levels of the pyramid. • As you move up the pyramid, more energy is lost at each level. Therefore, the leas ...
Age of the Earth
The age of the Earth is 4.54 ± 0.05 billion years (4.54 × 109 years ± 1%). This age is based on evidence from radiometric age dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.Following the development of radiometric age dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.The oldest such minerals analyzed to date—small crystals of zircon from the Jack Hills of Western Australia—are at least 4.404 billion years old. Comparing the mass and luminosity of the Sun to those of other stars, it appears that the Solar System cannot be much older than those rocks. Calcium-aluminium-rich inclusions – the oldest known solid constituents within meteorites that are formed within the Solar System – are 4.567 billion years old, giving an age for the solar system and an upper limit for the age of Earth.It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites. Because the exact amount of time this accretion process took is not yet known, and the predictions from different accretion models range from a few millions up to about 100 million years, the exact age of Earth is difficult to determine. It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.