Science: 7th Grade [§
Texas Legacy site hosts a variety of educational curricula, lesson
plans, keys and ideas, and supporting media, including video,
databases, transcripts and other material. Below you can find
the TEKS standards for Science for the 7th Grade, as described in section
112.23, with relevant
activities drawn from this archive.
The student conducts field and
laboratory investigations using scientific methods,
critical-thinking, problem-solving, and using tools such as weather
instruments and calculators to collect and analyze information to
explain a phenomenon:
Excerpts of TEKS Text
In Grade 7, the study of science includes conducting
field and laboratory investigations using scientific methods,
critical-thinking, problem-solving, and using tools such as
weather instruments and calculators to collect and analyze
information to explain a phenomenon. Students also use computers
and information technology tools.
have identified a topic to investigate, they can use computers
to search TexasLegacy.org’s databases for information, and to
learn from the narrators. Critical thinking skills can be used to determine if
the information provided by the narrators has scientific merit.
Specific suggested activities are proposed to the right.
Look at and discuss the following video
excerpts and transcripts, as they show various ways of
describing and explaining the natural world from different
Ruth Lofgren, a San Antonio microbiologist,
talks about the beauty and essential activity she sees through
Jim Earhart, a Laredo biologist, talks about
his close review of government reports uncovered new insights
about water pollution in the Rio Grande.
Tony Amos, a
Port Aransas oceanographer, talks about how studies of the seas
changed as electronic sampling devices were developed.
a NASA geologist from Clear Lake City, tells
how orbital imaging can track, describe and help explain
phenomena on the earth's surface.
Science is a way of learning about the natural world. Students
should know how science has built a vast body of changing and
increasing knowledge described by physical, mathematical, and
conceptual models, and also should know that science may not
answer all questions.
Search the TexasLegacy.org database of narrators
involved in to see examples of how knowledge has
The natural world is described
with increasing detail and breadth by scientific models.
Sometimes, though the theory reaches beyond
the evidence. Oceanographer
points out the importance of securing ground truth to test
the reality is still too complex for a single model to describe
Campbell Read and
point out about the Gaia theory (that the Earth's ecosystem
resembles a great cell).
The gaps in
our understanding can be filled by a faith, wonder and love of
nature that drives our curiosity and learning, as
we need to realize that sometimes science doesn't answer all the
questions simply because the questions are not asked.
George Russell reminds us that we often act in
ignorance of what is already known.
Marvin Legator point out that questions are
sometimes willfully avoided for economic reasons.
Clark Hubbs sees research being dropped for political
and sentimental reasons.
system is a collection of cycles, structures, and processes that
interact. Students should understand a whole in terms of its
components and how these components relate to each other and to
the whole. All systems have basic properties that can be
described in terms of space, time, energy, and matter. Change
and constancy occur in systems and can be observed and measured
as patterns. These patterns help to predict what will happen
next and can change over time.
Many TexasLegacy.org narrators
discuss changes in systems, and make predictions on what will
occur. Students can
look at narrators who made predictions several years ago to see
how accurate their predictions were, or if they were successful
in effecting change for the better.
Perhaps there were dire predictions made that never
happened, or haven’t yet happened. Look for these, and explain
why the ‘bad news’ predicted didn’t happen, or if we are still
facing future problems.
There are many interlocking cycles
in nature. The narrators listed below describe a number of
Walt Davis, and
Ruth Lofgren show the
many ways in which organic decay and recycling is essential in
Walt Davis explains how nitrogen can be provided to the
soil either through chemical fertilizers or via legumes.
tells us how mercury from utility emissions is cycled through
the air, sediment and fish and human tissue.
Fauna and flora:
Trevino explains how the mockingbird's and hackberry's
life cycles intersect.
Daniel Quinn and
McKinney show how creatures up and down the foodchain