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- Maheshtala College
- Maheshtala College

... The Earth is composed of four different layers. The crust is the layer that you live on, and it is the most widely studied and understood. The mantle is much hotter and has the ability to flow. The outer core and inner core are even hotter with pressures so great you would be squeezed into a ball sm ...
Unit 3 Vocabulary
Unit 3 Vocabulary

... Transform fault - area where tectonic plates slide horizontally past each other Volcanic arc - curved line of volcanic islands that forms parallel to a plate boundary Appalachian - from the Apalachee word abalahci, meaning “other side of the river” Fault-block Mountain - parallel ridges that form wh ...
10-3 Directed Reading
10-3 Directed Reading

... In the space provided, write the letter of the definition that best matches the term or phrase. ...
Document
Document

... In the space provided, write the letter of the definition that best matches the term or phrase. ...
File
File

... 19. In California, there is a transform boundary between the North American Plate and what other plate? ...
File
File

... egg. Draw an illustration and label where the core, mantle and crust would be located. Do not write these questions. 2. How are the layers of an egg different from the layers of the Earth? 3. How are the layers of the Earth similar to the layers of an egg? Essential Question: What are the layers of ...
Earth`s Structure
Earth`s Structure

... 19. In California, there is a transform boundary between the North American Plate and what other plate? ...
Continental Drift and Plate
Continental Drift and Plate

... According to the theory of continental drift, the world was made up of a single continent through most of geologic time. That continent eventually separated and drifted apart, forming into the seven continents we have today. The first comprehensive theory of continental drift was suggested by the Ge ...
Geologic Time - Tulane University
Geologic Time - Tulane University

... that fossils that were contained in the rock could also be used to determine relative age. It was soon recognized that some fossils of once living organisms only occurred in very old rocks and others only occurred in younger rocks. Furthermore, some fossils were only found within a limited range of ...
Print › Earthquakes: Chapter 5 | Quizlet
Print › Earthquakes: Chapter 5 | Quizlet

... Richter Scale: Rating the size of the seismic waves using a seismograph - works well for small nearby earthquakes but not accurate for large or distant earthquakes. ...
Earth Science
Earth Science

... • Must have features that clearly distinguish it from other fossils • Organism must have lived during a short span of geologic time • Must occur in fairly large numbers within the rock layers ...
The Earth`s Layers Foldable
The Earth`s Layers Foldable

Venus - Sdbv
Venus - Sdbv

... What happened to the water? Evidence is that it was lost to space. Venus Express observed evaporation from Venus to space. ...
What type? - El Camino College
What type? - El Camino College

... Erosional Agents and Deposition ...
constructive__destructive_forces ppt
constructive__destructive_forces ppt

... • Scientists study earthquakes so that they can understand how they work and so that they can try to ...
Plate Tectonics - St. Ambrose School
Plate Tectonics - St. Ambrose School

... In 1912 Alfred Wegener theorized that 225 million years ago all continents were joined in one large continent he called Pangea (meaning “all Earth”). ...
Forces in Earth`s Crust Objectives After completing
Forces in Earth`s Crust Objectives After completing

Plate Tectonics
Plate Tectonics

... the surface by volcanic eruptions. The upper boundary of the mantle is defined by a discontinuity in seismic wave velocity which was discovered by the seismologist Mohorovicic and later named after him. Today this name has been shortened to Moho. Although the mantle behaves like a solid when transmi ...
Seventh Grade Geography and Economics Pre/Post Quarter One
Seventh Grade Geography and Economics Pre/Post Quarter One

... c. Location is where a place exits exactly or where a place is relative to another place. d. Location is the strengths and weaknesses of a country. 3. Geographers use the term place to describe which of the following? a. The mix of human and nonhuman features at a given location b. The altitude of a ...
Modeling Earth Interior
Modeling Earth Interior

... Three centuries ago, the English scientist Isaac Newton calculated, from his studies of planets and the forces of gravity, that the average density of the Earth is twice that of surface rocks and therefore that the Earth's interior must be composed of much denser material. Our knowledge of what's in ...
AP ENVIRONMENTAL SCIENCE
AP ENVIRONMENTAL SCIENCE

... 11. long, narrow island running parallel to mainland built by action of waves and currents 12. part of mantle that lies just below the lithosphere ...
Earth History
Earth History

... level (deposition – under water) 2. Erosion – some time after 3. Submergence (subsidence) below sea level 4. Deposition – new sediments deposited on top of the buried eroded surface ...
Chapter 9 Planetary Geology What are terrestrial planets like on the
Chapter 9 Planetary Geology What are terrestrial planets like on the

... can be attributed to plate tectonics, which gradually remakes Earth s surface Venus does not appear to have plate tectonics, but entire surface seems to have been repaved 750 million years ago ...
Final Review Answers - Academic Computer Center
Final Review Answers - Academic Computer Center

... _____ 3. The tilt of Earth’s axis is responsible for its seasons. _____ 4. An eclipse of the Moon occurs approximately every 28 days. False, because of the tilt of the Moon’s orbit it will not always fall in the Earth’s shadow _____ 5. The amount of the lunar surface that is illuminated by the Sun c ...
2PlateTectonicsPowerPoint4
2PlateTectonicsPowerPoint4

... – Sea floor slowly spreads apart. ...
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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.
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