Lecture 3 Spring 2010

Lecture 3 Spring 2010 - Lecture 3 Outline Notes Chapter 2...

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Lecture 3 Outline Notes – Chapter 2 Bottom Line: The __________________ relative to its orbit around the Sun results in predictable change in the _____________ of daylight and the __________ of sunlight received at any latitude throughout the year. These changes cause the annual cycle of seasons and associated temperature changes. The Seasons There are four factors involved in causing seasonality on the earth: 1.Earth’s ______________ 2. Earth’s ______________ 3. Earth’s ______________ 4. Earth’s ______________ 1. Earth’s orbit The Earth __________ around the sun. Each revolution takes slightly more than 365 days. This revolution, combined with sphericity, axial tilt, and axial parallelism, creates the seasons. Traits of Earth’s orbit. The Earth’s orbit around the sun is not a perfect circle: it is _____________meaning it is a closed, oval path. Furthermore, the distance between the earth and sun is not always the same. ________________ is the point where the earth is closest to the sun, which occurs in the Northern Hemisphere winter (January). So, we have winter during the time when the sun is closest. Obviously, other factors are more important in creating the seasons. _________________: is the point where the earth is farthest from the sun, which occurs in the Northern Hemisphere summer (June). The ___________ of the earth’s orbit changes over time, as does the ____________between the earth and the sun, and during which season (northern hemisphere _________ or _______) the earth is closest/farthest from the sun. The distance from the sun varies 11 million miles. Which is true? A. The earth’s orbit forms a perfect circle around the sun. B. The earth is closest to the sun during the northern hemisphere summer. C. The point where the earth is farthest from the sun is called aphelion. D. The shape of the earth’s orbit around the sun never changes. T/F The main reason it is winter in the northern hemisphere in January is because the sun is farther way. 2. Earth’s sphericity Because the earth is nearly a__________, and so is curved, not all places receive the same amount of insolation. Places that are ___________________ the sun’s rays receive more concentrated doses of insolation; places that _____________ from the sun receive less. You will see that the sphericity, combined with parallelism, tilt and orbit, create the seasons.
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The ______________________ is the point receiving insolation from directly overhead, 90
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Lecture 3 Spring 2010 - Lecture 3 Outline Notes Chapter 2...

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