# Instructional design/Technology-based lessons/What is a TBCL

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## Key Components of a TBCL

A TBCL is easily recognized when you walk into a classroom and see a group of students (many with eyes glazed over)

staring at a teacher (who is often lecturing), or busily flipping through the pages of a textbook and filling out

answers on a piece of paper.

The key components of a TBCL are the students, teacher, a textbook, some paper, and a pencil.

## Teacher Perspective

A textbook chapter lesson (TBCL) is a lesson that a teacher follows the directions

of a textbook, assigns readings and problems from the textbook for homework, and then

gives the students a paper and pencil test to see if they have accomplished the

desired level of mastery.

## Student Perspective

Students that learn through a TBCL are usually given a textbook that they are

responsible for until the end of the year and they must learn their subject

matter from this textbook.

Here is an example TBCL on plate tectonics.

 Plate Tectonics Students, you need to copy down these notes into your notebook to study. Then, complete the chapter review in your book on page 578. Inside the Earth What is it made of? • Crust-outermost layer • Mantle-the middle layer • Core-the center of the earth The Crust • Two different types—oceanic and continental. • Between 5 and 100 km thick • The thinnest layer of the earth • Made of oxygen, silicon, and aluminum. • Oceanic crust has more iron, calcium, and magnesium than continental crust. The Mantle • The largest layer—all molten • Contains almost all mass of the earth • We have never been to the mantle • Scientists guess, based on seismic waves, that the mantle is 2900 km thick • They also can guess based on what comes out of volcanoes. • It has mostly magnesium and aluminum The Core • The center of the earth. • Think that it is mostly iron, with small amounts of nickel • No oxygen, silicon, aluminum, or magnesium • Makes up 1/3 of Earths mass Physical Structures • Lithosphere is the crust and upper part of mantle, 15-300 km thick • Asthenosphere is where the tectonic plates move in the mantle, 250 km thick. • Mesosphere is the bottom part of the mantle and outer core, 2,550 km thick • Outer core is 2,200 km thick • Inner core is 1,230 km thick Mapping the Interior Because of seismic waves from earthquakes, we have been able to map the depths of the layers based on how fast waves move through them.