Earth Science | Life Science | Physical Science |
1.About this Evaluation Report 2.Content Analysis 3.Instructional Analysis
[Explanation] This section examines whether the curriculum material's content aligns with the specific key ideas that have been selected for use in the analysis. |
[Explanation] This section examines whether the curriculum material develops an evidence-based argument in support of the key ideas, including whether the case presented is valid, comprehensible, and convincing. |
[Explanation] This section examines whether the curriculum material makes connections (1) among the key ideas, (2) between the key ideas and their prerequisites, and (3) between the key ideas and other, related ideas. |
[Explanation] This section notes whether the curriculum material presents any information that is more advanced than the set of key ideas, looking particularly at whether the “beyond literacy” information interrupts the presentation of the grade-appropriate information. |
[Explanation] This section notes whether the curriculum material presents any information that contains errors, misleading statements, or statements that may reinforce commonly held student misconceptions. |
Idea
b: Several processes contribute to changing the
Earth’s surface.
Idea
c: The processes that shape the Earth today are
similar to the processes that shaped the Earth
in the past.
Idea
d: Some of the processes are abrupt, such as earthquakes
and volcanic eruptions, while some are slow, such
as the movement of continents and erosion.
Idea
e: Slow but continuous processes can, over very
long times, cause significant changes on the
Earth’s surface.
Idea
f: Matching coastlines and similarities in rocks
and fossils suggest that today’s continents
are separated parts of what was a single vast
continent long ago. Although this statement does include some of the historic
evidence for continental drift, it does not explain that
the evidence consists of the clues that scientists used
to develop the idea that continents moved. Also, two notes
in the teacher's lesson plan may help to present the historic
context but seem to be optional, and there are no instructions
to help teachers to introduce this information to students.
One note in the lesson plan says to have students make continental
cutouts and move them to simulate tectonic movement. The
other note explains that early map-makers “were impressed
by how the east coast of South America seemed to ‘fit’
with the central and southwestern coast of Africa”
(8.4.23.1, LP1, p. 8). Lastly, two videos show how the coastlines
have matched up to form Pangaea (6.1.4.3, and 7.4.32), but
this phenomenon is not labeled specifically as evidence
for the ancient supercontinent.
Paleontologists have found the fossils of
identical creatures in both Europe and North America. Also,
they have found mountain ranges of the same age and rock
formations on the two continents. How could fossils and
mountain range structures with the exact same age be found
on continents separated by 2,000 miles of ocean? Discuss
the students' responses. [8.4.23.1,LP1, p. 8]
Idea
g: The solid crust of the Earth consists of separate
plates that move very slowly, pressing against
and sliding past one another in some places, pulling
apart in other places. This key idea is mentioned again in grade six. The cluster
3 story line explains that tectonic movement is one way
in which environments can be changed. In one of the activities
in lesson 1 of cluster 3, students see photographs and read
text from the How Land Changes Database. The description
of tectonic movement explains: In grade seven, students study how the continents have
moved over time. A video is provided that shows the shapes
and locations of the continents and how they have changed
since Pangaea. The video also shows the outline of the plate
boundaries and the three types of plate motion. However,
the distinction between plates and continents is not clear.
Students also brainstorm what causes the continents to move
over time. Students practice this idea only by answering
questions that imply that the continents (not the plates)
have moved, such as: “What modern-day continents were
once part of Laurasia?” (7.4.32.4, SI32–4a,
p. 860). In grade eight, students return to plate tectonics.
They are shown a demonstration of a convection current and
watch a video that uses crusted lava to represent how the
Earth' s plates interact.
[Y]ou can see from this present-day
sketch of the continents that each continent is attached
to plates below the surface of the land and water [only
the continents are included in the sketch; the details of
the plates are not shown]. These plates are constantly in
motion, but they move so slowly that the changes of their
positions can only be seen over long periods of time [tectonic
movement is found in the How Land Changes Database]. [6.1.3.1]
Idea
h: Landforms and major geologic events, such as
earthquakes, volcanic eruptions, and mountain
building, result from these plate motions.
Unfortunately, the material does not include such experiences. While the unit problem does a very good job of framing the activities in a unit, there does not appear to be a plan for the conceptual development of ideas across units. The key Earth science ideas are rarely related to one another. Furthermore, quite sophisticated ideas show up in earlier grades and are repeated in later grades. For example, the idea that the Earth' s surface consists of separate moving plates (Idea g) is introduced first in fifth-grade materials in the context of an activity in which students make a model of mountains (5.1.5.4). This key idea is addressed next in sixth-grade materials in the context of changing environments, but with no reminder to students (or the teacher) that they may have encountered this key idea before (6.1.3.1). In grade seven, this key idea is addressed in the context of exploring how the continents have changed location over time (7.4.32.4). The material does not link these experiences with the experiences students had with the idea in sixth-grade materials.
Not only does the material not tie together the different experiences students have had with a key idea, it does not even alert teachers to the individual instances in which the same idea is treated so that they can design their own ways of tying the experiences together. The unit overviews identify only topic headings (which are usually not specific enough to give any indication about what ideas are addressed), and rarely make mention of treatment of any of the ideas in other units (at the same or earlier grades).
Few, if any, relevant connections are made to concepts outside this set of key Earth science ideas. Although Science 2000 recommends the use of models to show the Earth' s processes, it misses the opportunity to connect its use of models to the role of models in science.
The evaluation teams’ collective findings, presented below, should be taken as having general applicability to all of the evaluated materials, not complete and specific applicability in toto to any one of them.
Identified errors occur most frequently in drawings and other diagrams. They take the form of representations that are likely to either give rise to or reinforce misconceptions commonly held by students. Following are Earth science examples of the kinds of misleading illustrative materials of most concern to the evaluation teams:
- Maps that do not show the accurate locations of earthquakes and volcanoes will prevent students from understanding the relationship between these events and plate boundaries. Likewise, diagrams and maps that do not include legends, and photographs that do not explain the size and scale of the object seen, are difficult for students to understand.
- Diagrams that (a) depict plates moving away from one another, thus exposing the mantle, (b) show the mantle very close to the surface of the Earth, or (c) show plates as being a layer under the crust inaccurately represent the structure of the Earth and the motion of plates.
- Diagrams that show the melting of subducted plates are incorrect. Subducting plates are known to cause melting in the mantle, and thus nearby volcanic activity, but the plates do not melt.