9 - Mr. Neason`s Earth Science
... learned that Earth’s magnetic field occasionally reverse polarity. That is, the north magnetic pole becomes the south magnetic pole and visa versa. When Earth’s magnetic field, it is said to be normal polarity. When the magnetic field lines up in the opposite direction, it is said to have reverse po ...
... learned that Earth’s magnetic field occasionally reverse polarity. That is, the north magnetic pole becomes the south magnetic pole and visa versa. When Earth’s magnetic field, it is said to be normal polarity. When the magnetic field lines up in the opposite direction, it is said to have reverse po ...
Unit 5 – Structure of the Earth
... supercontinent formed when all of earth’s landmasses were joined • Scientists didn’t believe him for almost 50 years ...
... supercontinent formed when all of earth’s landmasses were joined • Scientists didn’t believe him for almost 50 years ...
GRAVITY AND MAGNETIC METHODS
... 2.4 Use of magnetics in Geothermal Exploration Magnetic surveys are an effective method to locate a prospective geothermal reservoir. For example, igneous and metamorphic rocks generally have a higher magnetic susceptibility than sedimentary rocks. An igneous intrusion or pluton is detectable in a m ...
... 2.4 Use of magnetics in Geothermal Exploration Magnetic surveys are an effective method to locate a prospective geothermal reservoir. For example, igneous and metamorphic rocks generally have a higher magnetic susceptibility than sedimentary rocks. An igneous intrusion or pluton is detectable in a m ...
Testing Plate tectonics
... permanent magnetization acquired by rock that can be used to determine the location of the magnetic poles at the time it became magnetized. When certain rocks containing iron-rich minerals (magnetite) are heated above a certain temperature, they lose their magnetic properties (convergent boundary). ...
... permanent magnetization acquired by rock that can be used to determine the location of the magnetic poles at the time it became magnetized. When certain rocks containing iron-rich minerals (magnetite) are heated above a certain temperature, they lose their magnetic properties (convergent boundary). ...
Chapter 4 - TeacherWeb
... northern half of Pangea; formed 180 million years ago when Pangea broke in half ...
... northern half of Pangea; formed 180 million years ago when Pangea broke in half ...
Chapter 2
... joined in a single supercontinent which he named Pangaea. • He proposed that Pangaea began breaking up 180 million years ago. • At the time, his proposal was not widely accepted by he could not explain HOW this occurred. ...
... joined in a single supercontinent which he named Pangaea. • He proposed that Pangaea began breaking up 180 million years ago. • At the time, his proposal was not widely accepted by he could not explain HOW this occurred. ...
Plate Tectonics Continental Drift
... • Glacial evidence found in areas that are now warm. • Glaciers do not move from sea to land only land to sea so continents had to be in different place. ...
... • Glacial evidence found in areas that are now warm. • Glaciers do not move from sea to land only land to sea so continents had to be in different place. ...
Plate Tectonics
... Wegener also presented some fossil evidence. One was an animal fossil and the other was a plant fossil. Mesosaurus was an aquatic dinosaur closely related to the modern Alligator. Its fossil remains are only found near the eastern side of South America and the adjoining western side of Africa when ...
... Wegener also presented some fossil evidence. One was an animal fossil and the other was a plant fossil. Mesosaurus was an aquatic dinosaur closely related to the modern Alligator. Its fossil remains are only found near the eastern side of South America and the adjoining western side of Africa when ...
Plate Tectonics Vocabulary Word Search
... ______________ fault- In plate tectonics, a boundary between two plates that are sliding horizontally past one another. ...
... ______________ fault- In plate tectonics, a boundary between two plates that are sliding horizontally past one another. ...
Evidence of continental drift
... rocks break and form a crack between the plates. • Earthquakes occur along the plate boundary. • Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano or magma slowly come up and cools forming NEW OCEAN FLOOR! ...
... rocks break and form a crack between the plates. • Earthquakes occur along the plate boundary. • Magma rises through the cracks and seeps out onto the ocean floor like a long, thin, undersea volcano or magma slowly come up and cools forming NEW OCEAN FLOOR! ...
Powerpoint Presentation Physical Geology, 10/e
... Gravity meters – detect tiny changes in gravity at Earth’s surface related to total mass beneath any given point • gravity slightly higher over dense materials and slightly lower over less dense materials ...
... Gravity meters – detect tiny changes in gravity at Earth’s surface related to total mass beneath any given point • gravity slightly higher over dense materials and slightly lower over less dense materials ...
Unit 8 ~ Learning Guide Name
... -the Earth has undergone several magnetic reversals in the past, in which the north and south poles are reversed for a period of time -geologists and geophysicists discovered that the crust in the ocean recorded these reversals, it was even more positive proof that the lithosphere had to be in motio ...
... -the Earth has undergone several magnetic reversals in the past, in which the north and south poles are reversed for a period of time -geologists and geophysicists discovered that the crust in the ocean recorded these reversals, it was even more positive proof that the lithosphere had to be in motio ...
Instructions: Earth`s Layers Questions
... -the Earth has undergone several magnetic reversals in the past, in which the north and south poles are reversed for a period of time -geologists and geophysicists discovered that the crust in the ocean recorded these reversals, it was even more positive proof that the lithosphere had to be in motio ...
... -the Earth has undergone several magnetic reversals in the past, in which the north and south poles are reversed for a period of time -geologists and geophysicists discovered that the crust in the ocean recorded these reversals, it was even more positive proof that the lithosphere had to be in motio ...
Plate Boundaries
... • Hot spot: long-lasting, extra hot region in mantle; causes volcanism – Can track movement of a plate over a hot spot – Volcanoes form and move away from hot spot as plate moves. – New volcanoes then take place of old ones. ...
... • Hot spot: long-lasting, extra hot region in mantle; causes volcanism – Can track movement of a plate over a hot spot – Volcanoes form and move away from hot spot as plate moves. – New volcanoes then take place of old ones. ...
Essay Question Outline
... • Over Time: Continents drifted apart creating Gondwanaland and Laurasia, then Laurasia broke apart into North America, Europe and Asia. Then Gondwanaland broke into Africa, South America, Antarctica and Australia. Then India collided with Eurasia. Continents continue to drift apart due to the conve ...
... • Over Time: Continents drifted apart creating Gondwanaland and Laurasia, then Laurasia broke apart into North America, Europe and Asia. Then Gondwanaland broke into Africa, South America, Antarctica and Australia. Then India collided with Eurasia. Continents continue to drift apart due to the conve ...
Earth`s Interior
... 28.Why was Wegener’s theory rejected by other scientists: _______________________________ _______________________________________________________________________________ Section 4 Sea Floor Spreading page 141-147 Objectives: By the end of this section you should be able to: List eh evidence for sea ...
... 28.Why was Wegener’s theory rejected by other scientists: _______________________________ _______________________________________________________________________________ Section 4 Sea Floor Spreading page 141-147 Objectives: By the end of this section you should be able to: List eh evidence for sea ...
A gravity-driven electric current in the Earth`s
... [2] Extreme ultraviolet (EUV) radiation from the Sun ionizes the neutral gas of the Earth’s atmosphere, generating the ionosphere. With regard to electric currents, the ionosphere can be divided primarily into two layers, the E region at about 90 to 150 km altitude, and the F region above it [Vollan ...
... [2] Extreme ultraviolet (EUV) radiation from the Sun ionizes the neutral gas of the Earth’s atmosphere, generating the ionosphere. With regard to electric currents, the ionosphere can be divided primarily into two layers, the E region at about 90 to 150 km altitude, and the F region above it [Vollan ...
Dynamic Earth Processes
... Standard 3a: Students know features of the ocean floor (magnetic patterns, age, and sea-floor topography) provide evidence for plate tectonics. The basalt (rock of the ocean basins) have magnetic patterns (normal or reverse polarity) due to the Earth’s polarity at the time of the rocks creation. The ...
... Standard 3a: Students know features of the ocean floor (magnetic patterns, age, and sea-floor topography) provide evidence for plate tectonics. The basalt (rock of the ocean basins) have magnetic patterns (normal or reverse polarity) due to the Earth’s polarity at the time of the rocks creation. The ...
Continental-Drift-and-Seafloor-Spreading
... 3. Glossopteris- plant fossils found on different continents- Plant fossils 4. Tropical plant fossils that were found on an island in Artic Ocean! (Scratches in rocks made by glaciers in South Africa) The continental drift theory was NOT accepted because Wegener could not explain HOW the continents ...
... 3. Glossopteris- plant fossils found on different continents- Plant fossils 4. Tropical plant fossils that were found on an island in Artic Ocean! (Scratches in rocks made by glaciers in South Africa) The continental drift theory was NOT accepted because Wegener could not explain HOW the continents ...
No Slide Title
... Plates ‘float’ on the mantle Convection currents in the mantle move the plates around Movement causes earthquakes and volcanoes ...
... Plates ‘float’ on the mantle Convection currents in the mantle move the plates around Movement causes earthquakes and volcanoes ...
307 Final Review
... ____ 28. Continental drift was not widely accepted when it was first proposed because ____. a. Wegener couldn’t explain why or how the continents moved b. continental landmasses were too big to move slowly over Earth’s surface c. magnetic and sonar data proved that Wegener’s hypothesis was incorrect ...
... ____ 28. Continental drift was not widely accepted when it was first proposed because ____. a. Wegener couldn’t explain why or how the continents moved b. continental landmasses were too big to move slowly over Earth’s surface c. magnetic and sonar data proved that Wegener’s hypothesis was incorrect ...
Geomagnetic reversal
A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged. The Earth's field has alternated between periods of normal polarity, in which the direction of the field was the same as the present direction, and reverse polarity, in which the field was the opposite. These periods are called chrons. The time spans of chrons are randomly distributed with most being between 0.1 and 1 million years with an average of 450,000 years. Most reversals are estimated to take between 1,000 and 10,000 years.The latest one, the Brunhes–Matuyama reversal, occurred 780,000 years ago;and may have happened very quickly, within a human lifetime. A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field dropped to 5% of its present strength. Brief disruptions that do not result in reversal are called geomagnetic excursions.