Education of Earth Science
Online ISSN : 2423-8953
Print ISSN : 0009-3831
ISSN-L : 0009-3831
Volume 72 , Issue 3
Showing 1-5 articles out of 5 articles from the selected issue
Original Article
  • Yasushi SAKAKIBARA, Yuki OBINATA, Osamu YAMAURA, Tatsuya FUJIOKA
    2020 Volume 72 Issue 3 Pages 69-82
    Published: March 31, 2020
    Released: April 04, 2020
    JOURNALS RESTRICTED ACCESS

    Trial lessons about the formation of and changes to the Earth were conducted in the 7th grade at a junior high school. The objectives of this study were to ascertain the degree of understanding of earthquakes and see if there was an improvement in consciousness with respect to disaster risk reduction. In a post-lesson questionnaire survey, students were asked to think about what disasters could threaten them and how they would deal with disasters if they occurred in their locality after they studied the characteristic of seismic waves, the mechanism of earthquakes and other such matters. The results of questionnaires showed: 1) The contents that the students understood well in trial lessons were: “disaster damage” and “the way in which seismic waves travel.” 2) The contents that the students did not understand well were: “traveling speed,” “the vibrations of seismic waves” and “plate.” 3) The trail lessons proved to be quite effective not only with respect to the students gaining an understanding of the distributions of seismic intensity and hypocenters, and the types of disasters that have occurred in their localities, but also in the motivation that students told about earthquakes in their family. 4) It is currently impractical to incorporate the contents of disaster risk reduction education in the science unit about earthquakes. More lesson time for disaster risk reduction education to link with science lessons is needed.

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Technical Articles
Commentary Article
  • Yoshihisa HIROKI
    2020 Volume 72 Issue 3 Pages 107-112
    Published: March 31, 2020
    Released: April 04, 2020
    JOURNALS RESTRICTED ACCESS

    This paper discusses answers to the question “Are Grains of 2 mm in Diameter Gravel or Sand?” Geologists and sedimentologists examine the grain sizes of sediments and sedimentary rocks to classify them into gravel (conglomerates), sand (sandstone), or mud (mudstone), and it would not be a problem as to whether grains of 2 mm in diameter should be called gravel or sand. Grains are usually irregular in shape, and grains of just 2 mm in diameter with a perfectly spherical do not exist in nature. Grains around 2 mm in diameter can be classified into: gravel larger than 2 mm in diameter, or sand smaller than 2 mm in diameter in geological and sedimentological studies.

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