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The Moon
The Moon

... was thrown off the Earth and coalesced into a single body. Problem: Earth not spinning fast enough to eject large amount of material. 2) "Coformation": The Moon and Earth formed out of the same material at the beginning of the Solar System. Problem: Moon has different density and composition. 3) "Ca ...
Earth Structure and Composition Teaching Assessment
Earth Structure and Composition Teaching Assessment

... the Earth's surface is water. 2. After the model is completed, students will use the fishing line to cut straight through their model so they can observe the layers. 3. Following this activity they will label the diagram from the instructions they were given and answer the following questions in the ...
plate tectonics
plate tectonics

...  The Earth is made up of 3 main layers: ...
Inside the Earth
Inside the Earth

... earth’s layers similar to an egg? ...
Plate Tectonics Review Worksheet
Plate Tectonics Review Worksheet

... 1. Continental Drift: A theory proposed by Alfred Wegner that said all continents were once joined 300 million years ago in a single land mass called Pangaea. Over time the continents moved to their present day locations. 2. What are four pieces of evidence for continental drift? Fossils, puzzle fit ...
Geologic Change Over Time Study Guide 1. Describe what
Geologic Change Over Time Study Guide 1. Describe what

... Uniformitarianism is the principle that geological processes that happened in the past can be explained by those same processes that are happening now. Two examples of this would be a volcanic eruption in the past can be explained by volcanic eruptions today and steady erosion that occurred in the p ...
1.0 Earth`s surface undergoes gradual and sudden changes
1.0 Earth`s surface undergoes gradual and sudden changes

... educated guesses based on data they collect from events that shape and reshape our planet every day. They try to understand this evidence so that they can explain how our planet began and what it is made of. Developing A Model A model is an idea of something that cannot be fully known or seen. It is ...
Test Review Quiz B
Test Review Quiz B

... 17. The relative age of a rock is a. Less than the age of the fossils the rock contains. b. The number of years since the rock formed. c. Its age compared to the ages of other rocks. d. Its age based on how much Carbon-14 the rock contains. 18. Which of the following DOES NOT explain how the oceans ...
Inside the Earth
Inside the Earth

... © Copyright 2006. M. J. Krech. All rights reserved. ...
Layers of the Earth
Layers of the Earth

...  Introduce the activity by telling students that they are going to “make” the layers of the Earth.  The directions are on the slide, so the students will be able to read them as they move along with the project.  The students will get into groups of four. Have two students from each group come up ...
Geoscience Day Starters
Geoscience Day Starters

... What two things most influence the density of seawater? Salinity and gravity c. Temperature and lattitude Salinity and temperature d. Temperature and current values ...
Laers Of Earth
Laers Of Earth

... Earth has four layers. One is called the crust, another one is the mantle, and another one is the outer core, the last one is the inner core. Scientists think they know what is in Earth’s layers. They found out by studying seismic waves recorded seismographs during earthquakes. One of the layers is ...
Ch 17 PP
Ch 17 PP

... • Sea-floor spreading occurs at mid-ocean ridges and subduction occurs at deep ocean trenches. ...
Earth`s outer layer has moved.
Earth`s outer layer has moved.

... • Sea-floor spreading occurs at mid-ocean ridges and subduction occurs at deep ocean trenches. ...
Environmental Science
Environmental Science

... The Earth’s outer core is a dense liquid layer. At the center of the Earth is a dense, solid inner core, which is made up mostly of iron and nickel. • Although the temperature of the inner core is estimated to be between 4,000°C to 5,000°C, it is solid because it is under enormous pressure. • The in ...
Geography and Landforms Graffiti
Geography and Landforms Graffiti

... From the deepest ocean trench to the tallest mountain, plate tectonics explains the features and movement of Earth's surface in the present and the past. Plate tectonics is the theory that Earth's outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the ...
printer-friendly sample test questions
printer-friendly sample test questions

... In what way can this diagram serve as a model for what is occurring in the interior of the Earth? A. The interior of the Earth is composed of water. B. The interior of the Earth is also heated with fire. C. Both have circular movement of fluids due to convection. D. Both have circular movement of fl ...
Earthquake Notes
Earthquake Notes

... Fault - A fracture in the earthʼs crust where there has already been some movement Focus - Point of origin of earthquakes where waves travel outward in all directions Crust - Outermost layer of the earth Mantle - A layer of earth that lies beneath the crust Lithosphere - Outer portion of the earth c ...
Earth`s Interior and Plate Tectonics
Earth`s Interior and Plate Tectonics

... ►There are 3 different types ►Travel through earth’s layers ►Transmission depends on phase (density) of the layer ...
Lab 2 work sheet
Lab 2 work sheet

... 3a. What percentage of Earth’s plate boundaries are transform boundaries? 3b. What percentage of Earth’s plate boundaries are divergent boundaries? 3c. What percentage of Earth’s plate boundaries are convergent boundaries? ...
Geol 301 (Fall 2006)
Geol 301 (Fall 2006)

... For the first two boundaries below the surface (Moho and Lithosphere-Asthenosphere), it is easier to measure downward (0.35 cm and 1.0 cm) from the surface to adjust the length of the string. Note that converting the depth and radius measurements, in kilometers on the Table, to the 1:10 million scal ...
Which of these describes the lithosphere and the
Which of these describes the lithosphere and the

... •  Crust rides on top of the plates •  Plates ride on top of mantle which is in motion due to convection currents –  Convection currents can cause plates to move away from each other or toward each other. ...
Geology Rocks! - Billy B. Productions
Geology Rocks! - Billy B. Productions

... aggregate - Composed of mineral fragments or crystals mixed in one rock. crystal - A solid object with flat sides (called faces) that meet in straight lines and sharp points. element - A substance composed entirely of one of the more than 100 different types of atoms. erosion - The transportation of ...
Unit 1 Day 5.
Unit 1 Day 5.

... being worked out by geologists, and so we have to make a lot of best guesses in tackling these topics. A complete accounting of how our planet formed from clumps of space rock into something even theoretically capable of supporting life is really worth its own discussion. For our purposes, we can st ...
Skills Worksheet
Skills Worksheet

... 2. The hypothesis that continents can drift apart and have done so in the past is known as .______________________ 3. The ______________________ is the soft layer of the mantle on which the tectonic plates move. 4. ______________________ is stress that occurs when forces act to stretch anobject. 5. ...
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History of Earth



The history of Earth concerns the development of the planet Earth from its formation to the present day. Nearly all branches of natural science have contributed to the understanding of the main events of the Earth's past. The age of Earth is approximately one-third of the age of the universe. An immense amount of biological and geological change has occurred in that time span.Earth formed around 4.54 billion years ago by accretion from the solar nebula. Volcanic outgassing probably created the primordial atmosphere, but it contained almost no oxygen and would have been toxic to humans and most modern life. Much of the Earth was molten because of frequent collisions with other bodies which led to extreme volcanism. One very large collision is thought to have been responsible for tilting the Earth at an angle and forming the Moon. Over time, the planet cooled and formed a solid crust, allowing liquid water to exist on the surface.The first life forms appeared between 3.8 and 3.5 billion years ago. The earliest evidences for life on Earth are graphite found to be biogenic in 3.7-billion-year-old metasedimentary rocks discovered in Western Greenland and microbial mat fossils found in 3.48-billion-year-old sandstone discovered in Western Australia. Photosynthetic life appeared around 2 billion years ago, enriching the atmosphere with oxygen. Life remained mostly small and microscopic until about 580 million years ago, when complex multicellular life arose. During the Cambrian period it experienced a rapid diversification into most major phyla. More than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earth's current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described.Geological change has been constantly occurring on Earth since the time of its formation and biological change since the first appearance of life. Species continuously evolve, taking on new forms, splitting into daughter species, or going extinct in response to an ever-changing planet. The process of plate tectonics has played a major role in the shaping of Earth's oceans and continents, as well as the life they harbor. The biosphere, in turn, has had a significant effect on the atmosphere and other abiotic conditions on the planet, such as the formation of the ozone layer, the proliferation of oxygen, and the creation of soil.
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