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Transcript of Earth History
So what does this mean? What is Evolution? With a partner, discuss what you think of when you hear "Evolution." Create a bubble map on the board. Plate Tectonics Earth's Changing Surface Evidence of Earth's History Geologic Time Scale A record of the major events and diversity of life forms present in Earth's history. We are going to look at how Earth has changed over time and how we can tell. 8.E.2.1 Infer the age of Earth and relative age of rocks and fossils from index fossils and ordering rock layers (relative dating and radioactive dating). We are going to look at how fossils are formed and what types of fossils there are. We will also examine different time periods in Earth's history. 8.E.2.2 Explain the use of fossils, ice cores, composition of sedimentary rocks, faults, and igneous rock formations found in rock layers as evidence of the history of the Earth and its changing life forms. We will look at what ice cores are, and how rocks layer to tell a story of what may have happened on Earth. Evolution means "change over time" What can we think of that has changed over time? To begin, we will look at how technology has changed. Many of you have your cell phones in your pocket, right? The first cell phones looked like this.... Before there were cell phones, many of your parents can probably remember the "bag phone." Many things are grouped into this title, but we are going to focus on how things around us have CHANGED OVER TIME. I got my first cell phone when I was 16. It only had 30 minutes of talk time(which I didn't use up). No texting. No internet. No camera. And terrible signal.
And somehow, I survived! In recent years we have seen technology soar with cell phones. The cell phone in your back pocket can likely do more than desktop computers could fifteen years ago. Computers are also something we can't seem to live without. the first computers took up entire rooms and were often little more than glorified calculators The evolution of computers, has changed dramatically over recent years. How do we use computers today that we may not have used them for in the past? As a class, discuss how technology has evolved. Think of six broad areas where technology has become different. (your parent's jobs, how you learn in school, how you are entertained...) Now, each group will be assigned one topic. Create a bubble map, chart, or list of how your topic has changed. How has technology allowed your topic to evolve?
Share with the class when completed. (Take 10 minutes) Hello!!
Make sure you have your vocabulary words written down and are working on any missing work.
Daily Question 2.20.13
If a layer of rock (a) is found below another layer of rock (b) wich layer is older? http://www.learner.org/interactives/dynamicearth/index.html To start off, think about your home….
What does your home look like?
What did your home look like 5 years ago?
What artifacts exist that prove that your home has changed over time?
Think about the land around your home. How has it changed over the past 5 years?
What artifacts exist that would allow one to see that the land has changed over time? Just like our homes have changed, the Earth has changed drastically over time. Get out a sheet of paper. We will take notes on a website about plate tectonics. Daily Question 2.22.13
How has movie technology changed from the time the video clip of Charlie Chaplin was created? Let's review what we learned on the website.... 1. The tectonic plates float on which semi liquid layer?
c. inner core
d. lithosphere 3. This solid layer of earth is made mostly of iron and nickel.
b. inner core
d. outer core 2. When did the supercontinent Pangaea break apart?
a. 20 million years ago
b. 40 million years ago
c. 100 million years ago
d. 200 million years ago 4. What is Earth's outermost layer?
d. outer core 5. Which of the following geologic events can occur at transform boundaries?
a. mountain boundaries
b. volcanic eruption
c. rift formation
d. earthquake 6. Which of these concepts is part of the plate tectonic theory?
a. Continents are fixed and do not move.
b. Continents are in slow constant motion. 7. Which scientist is credited with proposing the ideas that led to the development of the plate tectonic theory?
a. Charles Darwin
b. Albert Einstein
c. Issac Newton
d. Alfred Wegener 8. What is the border between two tectonic plates called?
a. Collision Zone
d. Trench 9. Mid-ocean ridges are places where plates are doing what?
b. sliding past each other
c. spreading apart
d. none of the above 10. It is believed the Earth's continents were once grouped into one landmass. What is this landmass called?
d. Pangaea Ultima 11. What is Earth's only liquid layer?
b. Inner Core
d. Outer Core 12. Mountain formation can result when which of the following occurs?
a. two continental plates collide
b. two oceanic plates collide
c. two oceaninc plate spread apart
d. none of these 13. Which of these statements is correct?
a. Continental crust is thicker than oceanic crust.
b. Continental crust in thinner than oceanic crust.
c. Continental crust and oceanic crust have the same thickness. Let's make sure we have it! We've looked at how Earth changes under the surface... Now let's look at how it changes ON the surface. Weathering Erosion The Rock Cycle http://www.bbc.co.uk/bitesize/ks3/science/environment_earth_universe/rock_cycle/activity/ Remember the wonderful British websites we have looked at, well...here is another one on the changing Earth. You will need to take notes on what weathering and erosion is, how rocks are formed, and the different types of rocks. This video will introduce you to these concepts.
The Rock Cycle Take out a sheet of notebook paper. Fold it in half hot dog style, and in half hot dog style again. this will make four columns. Type of Rock Formations Characteristics Examples Metamorphic Igneous Sedimentary Chemical or Physical altering of rock over time Condition by which Earth's surface is worn away over time, such as by wind or water. The Grand Canyon was formed over millions of years by erosion Weathering and erosion are the natural processes that break rock down. Metamorphic Rock Rock formed from the partial melting of other rock due to heat and pressure. Metamorphic rock is formed deep within the Earth's crust, when heat and pressure change igneous and sedimentary rock. Igneous Rock Rock formed by the cooling of magma. Sedimentary Rock Rock formed by the compacted and cemented particles of other rocks, shells, or animal bones. How do we know what existed in the past? Fossils the preserved remains or evidence of an organism that lived in a past age Viewing Guide - Copy the questions and answer in complete sentences during the video.
What are fossils, and what is the name of the scientist who studies them?
What is amber and why is it important to paleontologists?
What is important about the wooly mammoth body discovered in Siberia in 1997?
Why are there so many fossils in the Ashfall Beds? What are some of the discoveries scientists have made in studying them?
What are the fossilized tubes found in Mammoth National Cave? Video
Earth Science - Fossils Fossils are preserved remains or traces of living things. Most fossils form when living things die and are buries by sediments. The sediment slowly hardens into rock and preserve the shape of the organisms. Scientists who study fossils are paleontologists. Fossils are usually found in sedimentary rocks. When an organism dies, its soft parts decay quickly...leaving behind only the hard parts (bones, teeth, shell, seeds) to fossilize. Chapter 8 A Trip Through Geologic Time
Section 1 Fossils (p318-324)
Read this section and take notes on the types of fossils there are, and how fossils form.
Answer 1a, 1b, 2a, 2c, 3a, 3b (p324)
*YES, you have to write the questions! :) Many fossils form when living things die and are buried by sediment. The sediment slowly hardens and preserves the shape of the organism. In groups, complete the LiveBinder activity.
Answer the questions that go along with each section on a separate sheet of paper.
Each of you will need your own paper. Today
LiveBinder (finish today)
Copy Vocabulary Words
Turn to p331 in your textbook and read the section on Radiometric Dating. Paleontologists classify fossils in several different types..... Petrified (Permineralized) Fossils Fossils in which minerals replace all or part of the organism. When the object is buried by sediment, water rich minerals seep into the cells. After the water evaporates, hardened minerals are left behind. Molds and Casts Forms when sediment buries an organism and the sediment change into rock.... The organism decays, leaving behind a hollow space in the shape of the organism. Forms when a mold is filled with sand or mud that hardens into the shape of the organism. Carbonized Fossils Forms when organisms or parts, like leaves, are pressed between layers of soft mud or clay.... the mud hardens squeezing almost all the decaying organism away, leaving the carbon imprint on the rock. Trace Fossils Forms when the mud or sand hardens to stone where a footprint, trial, or burrow of an organism was left behind. Preserved Remains formed when an organism is preserved with little or no change Millions of fossils have been collected and studied. Paleontologists classify organisms in the order they lived.
All the information scientists collected is called the fossil record. The fossil record gives important information about past life and environments on Earth. Certain organisms can only live in certain times and under certain circumstances. One way to look at this, is to study the Geologic Time Scale. The Geologic Time Scale begins when scientists think Earth began and goes on until the present. At the end of each era a mass extinction occurred, although there were other forms of extinction going on during each period. Using the fossil record, paleontologists have created an idea of the different types of common organisms in each geologic period. You are going to research the Geologic Time Scale using information from your textbook and the charts. Turn to page 335 and begin...