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PLATE 1ECTONICS
PLATE 1ECTONICS

“Excess Argon”: The “Archilles` Heel” of Potassium
“Excess Argon”: The “Archilles` Heel” of Potassium

WORLD GEOGRAPHY TODAY Red Flag Questions Pages 63
WORLD GEOGRAPHY TODAY Red Flag Questions Pages 63

... CHAPTER 4: LANDFORMS, WATER, AND NATURAL RESOURCES SECTION 1: Landforms By the end of this section, you will be able to answer these questions: 1. What physical processes inside the Earth build up the land? 2. What physical processes on Earth’s surface wear down the land? 3. How do these physical pr ...
Divided into three layers based on composition
Divided into three layers based on composition

...  South America  African  Eurasian  Antarctic  See figure 4, page 66 ...
Earth`s Layers
Earth`s Layers

... because of convection currents. • Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling and sinking again • The cycle repeats over and over. • The molten rock below Earth’s surface is known as magma ...
Compilation of activites
Compilation of activites

... What are the names of all eight planets? What are some differences/ similarities of all the planets? What were some problems that students ran into? Were they fixable? Is this a lesson that can be continued in the future? Extension/ Variation: Teachers have the option of how many categories and ques ...
Constructive and Destructive Forces - TypePad
Constructive and Destructive Forces - TypePad

... • There are two main types of volcanoes: shield and composite. • Shield volcanoes are usually found in the middle of tectonic plates. Islands like Hawaii are good examples of this type of volcano. • There's a hole in the middle of the plate and magma moves out and piles on top of itself, slowly buil ...
EES 202 - Geological processes powerpoint
EES 202 - Geological processes powerpoint

... sea, swamp. ...
Section 1 Earth: A Unique Planet Section 2 Energy in the
Section 1 Earth: A Unique Planet Section 2 Energy in the

Continental drift and plate tectonics
Continental drift and plate tectonics

... moved over Earth’s surface. ...
The Earth
The Earth

... • it takes about 40,000 years for the CO2 cycle to restore balance ...
Mechanisms of Plate Motion
Mechanisms of Plate Motion

... Mantle Plumes – hot plumes of rock that are attributed to the upward flowing arms of mantle convection Mantle plumes sometimes show themselves on the surface as hot spots and volcanoes Whole-mantle convection is when slabs of cold oceanic lithosphere descend into the lower mantle, at the same time, ...
Volcano Video
Volcano Video

... When two plates spread apart magma rises to fill the gap. These zones are usually found in the middle of the ___________ where they create new sea floor. When two plates crash to together, one layer of the Earth gets folded under the other, a ___________________ zone. The lower layer of crust is ___ ...
a fully formatted pdf version of the note
a fully formatted pdf version of the note

... è g=  9.8m/s2  at  Earth’s  surface,  for  everything! 8.  Origins:  The  Earth  is  Born -­‐  Early  Earth  is  described  as  hellish,  hot,  bombarded  and  lifeless -­‐Sun  forma
9.5 Mechanisms of Plate Motion
9.5 Mechanisms of Plate Motion

... The mantle consists of liquid magma. Scientists cannot effectively study the mantle because they cannot experiment with it directly. ...
PANGEA
PANGEA

Slide 1
Slide 1

... • Craters are typically about 10 times as wide as the meteoroid creating them, and twice as deep. • Rock is pulverized to a much greater depth. • Most lunar craters date to at least 3.9 billion years ago; much less bombardment since then. ...
PLATE TECTONICS 2
PLATE TECTONICS 2

... move independently of one another, at varying speeds over Earth’s surface. • Based on the principle of buoyancy – that something less dense (wood) floats on something denser (water). ...
Plate Tectonics
Plate Tectonics

... Or, When Good Planets Go Bad ...
Document
Document

... • This is LOCKED in when the rock solidifies ...
What is Earth Science
What is Earth Science

... o Very thin outer layer (5 - 35 km) o Two kinds  Continental crust  Light in color and weight (granitic)  Averages ~35 km thick  Oceanic crust  Dark in color and more dense (basaltic)  Usually ~7 km thick  Mantle o Thickest layer (2870 km) o Directly under the crust o Rocky - made mostly of s ...
TELLING TIME GEOLOGICALLY UNCONFORMITIES Not all the
TELLING TIME GEOLOGICALLY UNCONFORMITIES Not all the

... Puts rocks in proper sequence. But….. It is important to know in years, how long ago an event happened or when a rock formed. NUMERICAL or ABSOLUTE DATING can do this to a point. Generally depends on some type of “natural clock”. Depends on a process that occurs at a known, constant rate. ...
instructor`s syllabus
instructor`s syllabus

... Course Title: Earth Science Course Description: For the non-science major. Introduces the concepts of earth processes and their relation to man, including basic principles from physical and historical geology, oceanography, astronomy, and meteorology. Lab required. Course Credit Hours: Lecture Hours ...
instructor`s syllabus
instructor`s syllabus

... Course Title: Earth Science Course Description: For the non-science major. Introduces the concepts of earth processes and their relation to man, including basic principles from physical and historical geology, oceanography, astronomy, and meteorology. Lab required. Course Credit Hours: Lecture Hours ...
Plate Tectonics Study Guide
Plate Tectonics Study Guide

... What geologic landforms are present at a convergent plate boundary? (Hint: there are three types of convergent plate boundaries) ...
< 1 ... 272 273 274 275 276 277 278 279 280 ... 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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