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Ask your colleague teaching history: She or he can tell you students have difficulty conceptualizing and contrasting the different historical eras, such as the medieval period in Europe and the colonial period in America.

However, to many middle school students, these answers boil down to variation on a single theme: really old, a long time ago, and for a long time.

The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah is a great example of Original Horizontality and the Law of Superposition, two important ideas used in relative dating.

These strata make up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park.

Second, we supply teachers with hands-on/minds-on lessons to develop student understanding, and third, we provide career-oriented resources to expose students to scientists whose work involves concepts in geologic time.

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However, "relative" dating or time can be an easy concept for students to learn.

The study of fossils and the exploration of what they tell scientists about past climates and environments on Earth can be an interesting study for students of all ages.

Teaching about Earth's history is a challenge for all teachers.

In this activity, students begin a sequencing activity with familiar items — letters written on cards.

Once they are able to manipulate the cards into the correct sequence, they are asked to do a similar sequencing activity using fossil pictures printed on "rock layer" cards.