2020 8-ESS1-1

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The Oklahoma Academic Standards for Science (OAS-S) are three-dimensional performance expectations representing the things students should know, understand, and be able to do to be proficient in science and engineering. Performance expectations are considered standards and include a science and engineering practice (indicated in blue and represent everyday skills of scientists and engineers), disciplinary core ideas (represented in orange and represent science ideas used by scientists and engineers), and a crosscutting concept (indicated in green and represent ways of thinking like scientists and engineers).

Each dimension in the OAS-S grows in complexity and sophistication across the grades. To learn more about the prior knowledge and skills students have developed (or future knowledge/skills) associated with that specific dimension, each section in the standard below is hyperlinked to that specific vertical learning progression page.

8.ESS1.1 Earth's Place in the Universe
8.ESS1.1 Develop and use a model of the Earth-Sun-Moon system to describe the cyclic patterns of lunar phases, eclipses of the sun and moon, and seasons.
Clarification Statement: Earth’s rotation relative to the positions of the moon and sun describes the occurrence of tides; the revolution of Earth around the sun explains the annual cycle of the apparent movement of the constellations in the night sky; the moon’s revolution around Earth explains the cycle of spring/neap tides and the occurrence of eclipses; and the moon’s elliptical orbit mostly explains the occurrence of total and annular eclipses. The position and tilt of Earth, as it revolves around the sun, explain why seasons occur. Examples of models can be physical, graphical, or conceptual.
Assessment Boundary: Definitions of spring or neap tides should not be included.
Science and Engineering Practices	Disciplinary Core Ideas	Crosscutting Concepts
Developing and Using Models Develop and use a model to describe a phenomenon.	The Universe and Its Stars Patterns of the apparent motion of the sun, the moon, and stars in the sky can be observed, described, predicted, and explained with models. Earth and the Solar System The model of the solar system can explain eclipses of the sun and the moon. Earth’s spin axis is fixed in direction over the short term, but tilted relative to its orbit around the sun. The seasons are a result of it’s tilt and are caused by the differential intensity of sunlight on different areas of Earth across the year.	Patterns Patterns can be used to identify cause-and-effect relationships.
Connections to other Performance Expectations in Grade 8 Science
Earth's Place in the Universe