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Riddle, Bob – Science Scope, 2001
Presents information on the planet Mercury and points out how little is known about this planet which is much closer than Pluto. Features a list of visible planets and moon phases. (YDS)
Descriptors: Astronomy, Earth Science, Middle Schools, Science Education

Riddle, Bob – Science Scope, 2001
Discusses the five upcoming shuttle missions, two Russian missions to the International Space Station, a scheduled visit to the Hubble Space Telescope for maintenance, and other events in the solar system. Includes a list of monthly events. (YDS)
Descriptors: Astronomy, Earth Science, Elementary Secondary Education, Science Instruction

Riddle, Bob – Science Scope, 2001
Describes occultation events involving the moon, when the moon blocks the view of planets or stars. Describes other events such as a partial solar eclipse, a penumbral lunar eclipse, meteor showers, and moon phases. Provides a list of internet resources related to these events. (DLH)
Descriptors: Astronomy, Data, Earth Science, Middle Schools

Riddle, Bob – Science Scope, 2003
Describes how to differentiate a planet from a star and presents an activity in which students investigate whether Pluto is a planet. (YDS)
Descriptors: Astronomy, Earth Science, Science Activities, Science Instruction

Riddle, Bob – Science Scope, 2003
Describes a celestial grid system that gives the coordinates for any object that delineates the sun's ecliptic path--the sun's apparent path through the year. Includes Internet resources. (KHR)
Descriptors: Earth Science, Middle Schools, Science Activities, Science Education

Riddle, Bob – Science Scope, 1997
Explains how Venus changes visibility regularly from morning to evening because of its quick orbit time during part of the year. Includes a brief history of observations of this phenomenon and provides a detailed account from the Australian Aborigines. (DDR)
Descriptors: Astronomy, Earth Science, General Science, Middle Schools

Riddle, Bob – Science Scope, 1993
Discusses and explains early people's fears and explanations of eclipses. Describes the lunar eclipse scheduled for November 28-29. (PR)
Descriptors: Astronomy, Earth Science, Junior High Schools, Learning Activities

Riddle, Bob – Science Scope, 1994
Narrates a story, "Why Sun Cautiously Rises," which is adapted from a Pahute Indian legend of a tale about the Sun's changing position. (ZWH)
Descriptors: American Indian Culture, American Indians, Astronomy, Earth Science

Riddle, Bob – Science and Children, 1988
Presents several classroom ideas to help students understand their relationship to and their place in the universe as well as how difficult it would be to find life beyond Earth. Lists activities for children including the "Map Procedure," the "Model Procedure," and "Good Ol' Sol." (CW)
Descriptors: Astronomy, Earth Science, Elementary Education, Elementary School Science

Riddle, Bob – Science Teacher, 1988
Describes a "tracing the sun" worksheet combining models with computer programs and classroom discussion. Provides the worksheet including the nine steps of the activity and several discussion questions. (YP)
Descriptors: Computer Assisted Instruction, Computer Software, Computer Uses in Education, Earth Science