On Target? Do this on your Warm Up worksheet! PLEASE put today’s date (5/22/17) in the MONDAY box of your warm up! How do variations in Oxygen in the water relate to glacial and interglacial periods? During a glacial period, evaporated water enriched in H216O is stored in glaciers. This increase the relative amount of H218O in the ocean. There is still H216O in the ocean during glacial periods, but the proportion of H218O has increased, as do the values of delta 18O (meaning there is more 18O relative to 16O in the ocean). During an interglacial period, evaporation over the ocean still occurs, but rain returns to the oceans by rivers and melting ice sheets return H216O to the ocean from glaciers. This decreases the delta 18O levels of the ocean during interglacial periods (meaning there is less 18O relative to 16O in the ocean).

Which one is glacial, and which one is interglacial? During a glacial period, evaporated water enriched in H216O is stored in glaciers. This increase the relative amount of H218O in the ocean. There is still H216O in the ocean during glacial periods, but the proportion of H218O has increased, as do the values of delta 18O (meaning there is more 18O relative to 16O in the ocean). During an interglacial period, evaporation over the ocean still occurs, but rain returns to the oceans by rivers and melting ice sheets return H216O to the ocean from glaciers. This decreases the delta 18O levels of the ocean during interglacial periods (meaning there is less 18O relative to 16O in the ocean).

Which one is glacial, and which one is interglacial? During a glacial period, evaporated water enriched in H216O is stored in glaciers. This increase the relative amount of H218O in the ocean. There is still H216O in the ocean during glacial periods, but the proportion of H218O has increased, as do the values of delta 18O (meaning there is more 18O relative to 16O in the ocean). During an interglacial period, evaporation over the ocean still occurs, but rain returns to the oceans by rivers and melting ice sheets return H216O to the ocean from glaciers. This decreases the delta 18O levels of the ocean during interglacial periods (meaning there is less 18O relative to 16O in the ocean).

For today . . . Warmup Carl Quizzes What causes the climate to cycle between glacial and interglacial periods? Astronomical theory of Climate Change Jigsaw Exit Slip Objective: I can relate Earth’s motions relative to the Sun (tilt, orbit, and wobble) to variations in global climate and solar radiation on Earth’s surface.

Carl Quizzes: Overall not too bad, but there were some MAJOR things missing and some MAJOR misconceptions: Carl is NOT always in the form of CO2! He can be carbonic acid, acid rain, or just plain carbon! Humans and animals do NOT breathe in CO2! They breathe in oxygen, and breathe OUT CO2. They get the CO2 from eating plants! Plants do NOT take in carbon from the soil or from water! It comes from the atmosphere! Lots of people were missing explanations of how Carl moved around the carbon cycle, as well as several processes (photosynthesis, cellular respiration, volcanoes, fossils).

Carl Quizzes: Graded by assigning a score to each of the 3 things I was looking for (locations, transfer processes, chemical explanations) and then averaging those scores (see top of your quiz) You have the opportunity to REDO your quiz! Either try again on another piece of paper attached to your quiz, or write your changes in a different color writing utensil on your original quiz. This is due on MONDAY 5/29, but if you finish it earlier you can turn it in to me

Brainstorm… What causes the climate to cycle between glacial and interglacial periods? 626

In your lab notebook Make a drawing that reflects what you already know about Earth’s orbit around the Sun. Label the Sun and Earth Show the orientation (tilt) and path of Earth through space Include information you know about distance and time Earth moves around the sun in an elliptical path. It takes 1 year to complete the cycle. The axis of Earth is tilted 23.5 degrees from the plane of travel around the Sun

Earth’s Orbit Around the Sun Earth moves around the sun in an elliptical path. It takes 1 year to complete the cycle. The axis of Earth is tilted 23.5 degrees from the plane of travel around the Sun

Astronomical theory of Climate Change Proposed in the mid 1800s Theory: the orbit of Earth around the Sun causes ice ages. Astronomical theory focuses on 3 factors in the orbital motion of Earth: The tilt of the Earth’s axis The changing shape of the Earth’s orbit around the Sun The wobble of the rotation axis 620

Today’s task… You will be a part of a breakout team. Your job is to become an expert on one of the 3 factors of orbital motion of Earth You will gather with those students, read the articles and discuss the information of your diagrams, as well as complete the Try This section of the reading (including answering the questions in your lab notebook!) Toward the end of the period, you will return to your normal groups and teach your other group members about your factor, as well as take notes about their factors 620

For the rest of the period… Team 1: Tilt (pg. 628- 629) Team 2: Eccentricity of Orbit (pg. 629-630) Team 3: Wobble (pg. 631-632) When finished, get back with original groups and teach each other! For each team (including your own), write a 2 sentence summary in your lab notebook about the factor and how it relates to the astronomical theory (work together and come up with them as a group!) 620