Hemphill Middle School Science STAAR Review Reporting category 3 : Earth & Space 8.7 A : model and illustrate hoe the tilted Earth rotates on its axis, causing day and night, and revolves around the sun causing changes in seasons Earth Day and Night The earth rotates or spins around its axis. The axis is an imaginary line running through the center of the earth from the north pole to the south pole. This rotation takes 24 hours causing the sun to rise and set. Earth’s axis tilts 23.5 degrees. 1 rotation = 24 hours or 1 day Earth and Sun Day and Night It takes just over 365 days or one year for the earth to complete on revolution around the sun. However because of its tilt, the sun’s rays hit the Northern Hemisphere longer and more directly in the summer than in the winter. When its summer in the Northern Hemisphere, it is winter in the Southern Hemisphere. Seasons- caused by the tilt of the axis One hemisphere is tilted away from the sun and receives less direct solar rays from the sun. The area around the equator isn’t affected by the earth’s tilt. Because it’s the middle, it will always have direct solar rays all year round. This is the reason for the seasons in the Northern and Southern Hemispheres.
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Hemphill Middle School Science STAAR Review
Reporting category 3 : Earth & Space 8.7 A : model and illustrate hoe
the tilted Earth rotates on its
axis, causing day and night, and
revolves around the sun causing
changes in seasons
Earth
Day and Night
The earth rotates or spins around its
axis. The axis is an imaginary line
running through the center of the earth
from the north pole to the south pole.
This rotation takes 24 hours causing
the sun to rise and set. Earth’s axis
tilts 23.5 degrees.
1 rotation = 24 hours or 1 day
Earth and Sun
Day and Night
It takes just over 365 days or one year for the earth to complete on revolution
around the sun. However because of its tilt, the sun’s rays hit the Northern
Hemisphere longer and more directly in the summer than in the winter. When
its summer in the Northern Hemisphere, it is winter in the Southern
Hemisphere.
Seasons- caused by the tilt of the axis
One hemisphere is tilted away from the sun and receives less direct solar rays
from the sun. The area around the equator isn’t affected by the earth’s tilt.
Because it’s the middle, it will always have direct solar rays all year round.
This is the reason for the seasons in the Northern and Southern Hemispheres.
8.7 B : demonstrate and predict
the sequence of events in the
lunar cycle
8.8 A : describe components of
the universe, including stars,
nebula, and galaxies, and use
models such as the Hertzsprung-
Russell diagram for
classification
Components of the Universe
Nebula Huge clouds of dust
and gas
Asteroid Large rocks that orbit
the sun
Comet Made of ice, dust, and
small rocks
Star A star is a ball of
hydrogen and helium
gas that is fueled by
nuclear fusion
Galaxy – a collection of stars held together by gravity. Our solar system
is the Milky Way Galaxy (spiral).
Types of Galaxies
spiral elliptical irregular
Star Classification
Stars are classified by their spectra (the element that they absorb)
surface temperature. There are seven types of stars. In order of
decreasing temperature; O, B, A, F, G, K, and M. O and B stars are
uncommon but very bright; M stars are common but dim.
Class Brightness Temperature Color
O Bright 30000-60000 Blue
B 10000-30000 Blue-White
A 7500-10000 White
F 6000-7500 Yellow-White
G 5000-6000 Yellow
K 3500-5000 Orange
M Dim 2000-3000 Red
Hertzsprung – Russell Diagram The H-R diagram is a graph that plots stars color (spectral type or surface
temperature) vs. its luminosity (brightness). The diagram shows 3 different
types of stars:
1. Most stars, including the sun, are “main sequence stars” fueled by
nuclear fusion converting hydrogen into helium. For these stars, the
hotter they are the brighter.
2. As stars begin to die, the become giants and supergiants (above the
main sequence). These stars have depleted their hydrogen supply and
are very cold.
3. Smaller stars (like our sun) eventually become faint white dwarfs (hot,
white, dim stars) that are below the main sequence. These hot,
shrinking stars have depleted their nuclear fuels and will eventually
become cold, dark, black dwarfs.
8.9 B : relate plate tectonics to
the formation of crustal features
Plate Tectonics Plate tectonics is the movement of large sections of the earth’s crust called tectonic
plates. These plates are constantly moving; however we are talking only centimeters a
year.
Plate Boundaries
The tectonic plates are floating on top of magma which causes them to move.
Tectonic plates collide with one another along Plate Boundaries. There are several
types of plate boundaries.
1. Transform
2. Divergent
3. Convergent
Caused by convection currents in the
magma.
Types of boundary Description
Transform
Where the two plates slide against each other in a
sideways motion. Occasionally this energy is released
suddenly in the form of large earthquakes.
Divergent
Examples:
Mid-ocean ridge
Fault block mountains
Rift valleys
Where two tectonic plates are moving away from each
other.
Convergent Where two plates push against each other. As two plates
rub against one another, a number of samll and large
earthquakes are common near convergent boundaries
There are 3 kinds of Convergent Boundaries:
a. Oceanic plate and oceanic plate
b. Oceanic plate and continental plate
c. Continental plate and continental plate
Type of convergent boundary Description
Oceanic and oceanic When two oceanic plates converge, one is
usually subducted under the other, and in
the process a trench is formed.
Oceanic and continental When and oceanic and continental plate
converge, the oceanic plate is subducted
(it’s more dense) under the continental
plate causing volcanoes and mountains.
Continental and continental Where two continental plates converge,
one is usually subducted under the other
causing mountains.
8.9 C : interpret topographic
maps and satellite views to
identify land and erosional
features and predict how these
features may be reshaped by
weathering
Topographic maps
Topographic maps are 2-D drawings of 3-D land formations.
A topographic map is often a very large scale map that shows the shape of the land’s
surface. Contour lines are imaginary lines that connect places of equal elevations. If
you were taking a hike along a mountainside and not walking either uphill or
downhill, you would be walking on a contour line. When contour lines are close
together, the slope is very steep and when they are farther apart the slope is less.
Example:
Example 2: satellite view/ erosion
8.7 C : relate the position of the
Moon and Sun to their effect on
tides
Tides
Tides are the periodic rise and fall of the ocean waters. They are caused by the
gravitational pulls of the sun and moon, as well as the rotation of the Earth. The sun
and moon pull on the earth
and the water.
8.8 B : recognize that the sun is a
medium size star near the edge
of a disc-shaped galaxy of stars
and that the sun is many
thousands of times closer to
earth than any other star
The Sun
Our sun is a medium sized yellow star near the edge of a disc-shaped galaxy of stars.
The Sun is many thousands of times closer to earth than any other star.
8.8 C : explore how different
wavelengths of the
electromagnetic spectrum such
as light and radio waves are used
to gain information about
distances and properties of
compounds in the universe
Electromagnetic Spectrum
Electromagnetic waves have different wavelengths; waves in the electromagnetic
spectrum vary in size. All electromagnetic waves travel at the speed- the speed of
light.
Radio waves and visible light are types of electromagnetic waves. They differ from
each other in wavelength. Wavelength is the distance between one wave crest to the
crest of the next.
Each type of wave on the spectrum has a different effect and use. Scientists use the
electromagnetic radiation given off by components in the universe to measure
distance in space and the composition of objects in our universe.
Radio waves
Objects in space, such as planets, comets, giant clouds of gas, stars, and galaxies give
off light at many different wavelengths. Some of the light they give off has very large
wavelengths.
Radio telescopes look at planets, comets, giant clouds of gas, stars, and galaxies. By
studying the radio waves originating from these sources astronomers can learn about
their composition, structure, and motion.
Electromagnetic waves are important because they provide scientist
with important information about the components of our universe.
EM waves are used to measure distance in space.
Light waves
Visible light waves are the only electromagnetic waves that we can see. We see these
waves as the colors of the rainbow. Each color has a different wavelength. Red has the
longest and violet has the shortest wavelength. When all the waves are together, they
make white light.
8.8 D : model and describe how
light years are used to measure
distance and size in the universe
Light year Distances in space are ginormous so using typical measurements
does not make since. Instead, astronomers use a unit of measure
called a light year.
A light year is the distance that light travels in one year.
8.9 A : describe the historical
development of evidence that
supports plate tectonic theory
Theory of continental drift
The theory of continental drift was proposed by Alfred Wegener in the early 1900’s.
The theory stated that the continents were once joined in a large
land mass called Pangaea. They have been drifting away from each
other for millions of years.
http://youtu.be/T1-cES1Ekto
Pangaea
Pangaea- this super continent was made up of all the continents on Earth. Over
time, these continents have broken apart, and slowly drifted away from each