Name _____________________________ Deep Time – Web Quest URL: http://deeptime.info/ Understanding the clock All of the events in Earth’s history happened at different times. An example would be that bacteria were on Earth before dinosaurs. This website shows the whole history of the Earth imposed over a clock. This clock shows the begging of Earth at 12 o’clock. The Earth is roughly ___________________________ years old. One second of this clock represents ________________ years and one hour is ____________________ years. How many years does one minute represent? This clock shows when several life forms, events, and eons happened in Earth’s long history. List the Life categories: List the Eon categories: List the Events categories: Click on the Moon formation. How was the moon formed according to the Giant Impact Hypothesis? __________________________________________________________________________________________ __________________________________________________________________________________________ Notice when you put your cursor over photosynthesis a leaf appears on the clock. This shows when the first photosynthesis occurred in Earth’s history. Using these markers, complete the following table: Event Moon formation Abiogenesis Photosynthesis Cyanobacteria Oxygen Orogens Rodinia When on the clock did this event happen? Give one fact from each event in Earth’s history Snowball Eons The Earth’s long history is broken up into Eons, just like a day is broken up into hours, minutes and seconds. For each of the Eons listed tell me the time they start and end. Eon Hadean Archean Proterozoic Paleozoic Mesozoic Cenozoic Time Start Time End Total hours Total time Total time = Total hours x 350 million years 1:40 5:20 3.5 1225 million years Major events during each Eon Eon Hadean What happened during the Eon Archean Proterozoic Paleozoic Mesozoic Cenozoic Review questions: What was the Great Oxygenation Event and when did it happen? __________________________________________________________________________________________ What are Cyanobacteria? __________________________________________________________________________________________ At the end of which Eon was the basis for modern life in place? __________________________________________________________________________________________ Life’s development on Earth Prokaryotes are the first Life form to arise. When did the oldest known fossilized prokaryotes appear? __________________________________________________________________________________________ What are Eukaryotes? __________________________________________________________________________________________ When did the Eukaryotes first appear on Earth? __________________________________________________________________________________________ Most likely the first multicellular organisms were thought to be: __________________________________________________________________________________________ When did the first animals arrive? __________________________________________________________________________________________ During what period did land plant first appear? __________________________________________________________________________________________ At the end of the Devonian Period 416-359 million years ago, what features evolved? __________________________________________________________________________________________ How long did dinosaurs last on Earth? __________________________________________________________ When did dinosaurs meet their demise? _________________________________________________________ What did the first mammals evolve from? __________________________________________________________________________________________ What characteristics do all mammals possess? __________________________________________________________________________________________ __________________________________________________________________________________________ How long have modern humans been around for? __________________________________________________________________________________________ Label the clock below with each of the categories from the Earth’s history. EVENTS EONS Hadean Archean Proterozoic Paleozoic Paleozoic Mesozoic LIFE Prokaryotes Eukaryotes Multicellular Animals Moon Formation Abiogenesis Photosynthesis Cyanobacteria Oxygenation Orogens
