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S05_4359_L02
S05_4359_L02

... Lecture 2. Earth's Interior & Plate Tectonics, continued Plate tectonics is driven by gravity (slab pull & mantle convection) & closely related to Earth’s interior temperature variations. Heating most materials decreases their rigidity and strength. Temperature (T) is a measure of a material’s kinet ...
Colliding Continents Answers
Colliding Continents Answers

... 4.4 bya (billion years ago) 6. What continent is believed to be the site of the earliest continental nuclei on Earth? ...
pptx
pptx

... TW scales relative to U Cosmochemical: uses meteorites – 10 TW 10, 20, 30 TW ≈ 10, 20, 30 ppb Geochemical: uses terrestrial rocks –20 TW Geodynamical: parameterized convection – 30 TW ...
Video: Colliding Continents - National Geographic Name: https
Video: Colliding Continents - National Geographic Name: https

Evolution of Life and Mass Extinctions
Evolution of Life and Mass Extinctions

... formed during the hot and humid conditions of the Carboniferous Period) Deposits of salt and gypsum are found in western NYS because old oceans that covered the state evaporated during the hot and dry Silurian Period (noted on reference tables) ...
Earth`s interior volc eq1
Earth`s interior volc eq1

... How the Layers Formed • As earth formed, it was made of hot molten magma and intense gravity. • As rocks melted, denser materials sank to the center of the Earth and became the core. • Less dense material rose to the surface and became the crust • The middle layer is the mantle. ...
Snicker`s Science - The Science Spot
Snicker`s Science - The Science Spot

... Tension is a force that pulls on the plates of Earth’s crust causing them to move apart. Compression is a force that pushes on the plates of Earth’s crust causing them to move together. ...
Layers of the Earth Vocabulary
Layers of the Earth Vocabulary

... Present in great quantity; well supplied; plentiful The soft layer of the mantle on which the lithosphere floats What parts something is made up of The transfer of heat by one substance to another by direct contact of particles of matter The transfer of heat by movements of fluids The layer of rock ...
Layers of the Earth Vocabulary
Layers of the Earth Vocabulary

... Present in great quantity; well supplied; plentiful The soft layer of the mantle on which the lithosphere floats What parts something is made up of The transfer of heat by one substance to another by direct contact of particles of matter The transfer of heat by movements of fluids The layer of rock ...
GEOLOGY 1--Physical Geology Lecture #2, 2/9/2006
GEOLOGY 1--Physical Geology Lecture #2, 2/9/2006

... Principles used to determine relative age The principle of lateral continuity states that an original sedimentary layer extends laterally until it tapers or thins at its edges. The principle of cross-cutting relationships states that a disrupted pattern is older than the cause of disruption. A laye ...
National Geographic – Colliding Continents Video
National Geographic – Colliding Continents Video

early-earth1 - WordPress.com
early-earth1 - WordPress.com

... • Our galaxy was formed - _________ billion years ago • Our Universe was formed - ________ billion years ago • Life on earth began _______ billion years ago • Human life began _________ years ago – the last _____ _________________ of the cosmic calendar. ...
Name Date Period ______ Reading Guide 2.1 Earth: A Unique
Name Date Period ______ Reading Guide 2.1 Earth: A Unique

... 1. crust: ...
Unwrapped Standard 3
Unwrapped Standard 3

... 1. Compare and contrast internal and external methods of energy transfer as it relates to plate tectonics, volcanoes, and earthquakes and the physical structures that they create. 2. Explain how the rock cycle is an example of earth’s ever-changing continuing process that interacts with the biogeoch ...
Quiz Study Guide Interior of Earth
Quiz Study Guide Interior of Earth

... List in order the layers of the Earth based on properties (behavior), and describe their properties. (Example: the inner core is solid and the outer core is liquid.) ...
Earth*s Surface Review
Earth*s Surface Review

... Objective: Students will be able to utilize the lesson outline in order to prepare for the test. ...
colliding continents video ws
colliding continents video ws

... 16. How many tectonic plates can be identified on Earth today? (1 point) 17. Where does old seafloor sink back into the Earth to be recycled? (2 points) 18. The world’s last supercontinent is known as _____________________. 19. How many years ago did the supercontinent Pangaea begin breaking up? (1 ...
Study Guide for 1st Nine Weeks Exam
Study Guide for 1st Nine Weeks Exam

Earth`s Layers Online Activity Directions: Dig into the Lithosphere
Earth`s Layers Online Activity Directions: Dig into the Lithosphere

... Name the thickest layer ... Name the thinnest layer ... Write as a fraction the relationship of the thinnest layer to the thickest layer. ...
Week 27 CCA-Earth Test Study Guide-Blank
Week 27 CCA-Earth Test Study Guide-Blank

IPLS Pages - Plain Local Schools
IPLS Pages - Plain Local Schools

... During radioactive decay, unstable atomic nuclei spontaneously break apart, or decay, releasing energy. • Radioactivity is the process by which atoms decay. • A half-life is the amount of time necessary for one half of the nuclei in a sample to decay to its stable isotope. In radiometric dating, sci ...
Name
Name

... 2. The relative age of a rock is its age generally; its age compared to the ages of other rocks. 3. The law of superposition states that, in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it. 4. The fossils of organisms that were w ...
Why do you think Earth has layers?
Why do you think Earth has layers?

... - Oceanic Crust – mostly Basalt bedrock (more dense) - Continental Crust – mostly Granite Bedrock (less dense) The deepest hole drilled by man is 7.6 mi deep (Kola Peninsula, Russia). That is only 1% of the Earth’s entire thickness. ...
7th Grade Science Unit 3 Vocabulary Uniformitarianism
7th Grade Science Unit 3 Vocabulary Uniformitarianism

... break down into a stable isotope of the same element or another element. ...
1_1_Nield
1_1_Nield

... Why an International Year of Planet Earth? ...
< 1 ... 402 403 404 405 406 407 408 409 410 ... 413 >

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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