Transcript Powerpoint 7

Volusia District Science Office
week
7
SC.7.E.6.6 – Human Impact
1
Over the past 50 years, people have diverted much of the water in the
Everglades to support large sugar cane farms. What negative result
would you expect that this had on the Everglades area?
It reduced the number of types of plants and animals.
B. It prepared a once useless area to be used as farmland.
C. It decreased the amount of land on which people could live.
D. It lowered the number of disease-causing mosquitoes in the area.
A.
SC.7.E.6.6 – Human Impact
2 As Franklin is walking to school, he notices a new
neighborhood being built. The first thing the builders do is
remove all of the trees. Which of the following effects
would result from this action?
A. an increase in soil erosion
B. a creation of new plant species
C. a reduction in levels of pollution
D. a growth in the variety of animals
SC.7.E.6.6 – Human Impact
3 Many farmers are starting to use pesticides to help control the
amount of damage their crops have from different organisms.
What is a risk of using chemical pesticides on crops?
A. rotation crop production
B. genetic mutation of existing crops
C. healthy crops with more harvestable product
D. chemical contamination of streams and rivers
SC.7.E.6.6
Human Impact
1. A
2. A
3. D
Overall Summary:
In general humans, have an impact on the Earth. Deforestation,
urbanization, desertification, erosion, a change in air and water
quality, and changing the flow of water are a few of these. Not all
impacts are negative.
Discussion?
SC.7.E.6.2 – Sedimentary Rock
4
Florida’s geology is primarily dominated by sedimentary rock.
Sedimentary rock is characterized by layers that form within the rock.
Which statement best explains why sediments are found in layers?
A. During cementation, smaller particles rise to the top, leaving
larger particles at the bottom of each layer.
B. During deposition, larger particles usually settle to the bottom
faster than smaller particles.
C. The moon’s gravity causes a cyclic patter in sediment
deposition.
D. Ocean-floor organisms sort fresh sediments into layers of
similar sizes.
SC.7.E.6.2 – Metamorphic Rock
5
The geology of any two regions of Earth may be completely
different from each other. Some areas have different types of rock
while others are completely covered with sediments. Which of
the following areas is most likely to form metamorphic rocks such
as gneiss and granite?
A. a sea floor
a windblown desert
C. a site deep underground
D. a site covered by a glacier
B.
SC.7.E.6.2 – Igneous Rock
6 Igneous rocks are usually formed from magma and lava that
cools down and then either crystallizes or clumps together.
Some examples include obsidian, basalt, and pumice. Which
of the following would you expect to see in a rock that took a
long time to cool and crystallize?
A. Large grains of minerals.
B. Small grains of minerals.
C. Larger rocks clumped together.
D. Smaller rocks clumped together.
SC.7.E.6.2
The Rock Cycle
4. B
5. C
6. A
Overall Summary:
There are three types of rocks: sedimentary, metamorphic, and igneous.
Sedimentary rocks are the long-term result of deposition of smaller
fragments. Metamorphic rocks require extreme temperatures and
pressures as found deep within the Earth. Igneous rocks are from lava
or magma that has cooled down. Rocks can change from one type to
another through the rock cycle.
Discussion?
SC.7.E.6.7 – Effects of Convecting Material
7 As magma rises through the cracks of a spreading seafloor, it
cools and adds new rock to the ocean floor. The ribbon of
magma causing the spreading is most similar to which
structure?
A. A glacier
B. A volcano
C. A valley
D. A sinkhole
SC.7.E.6.7 – Effects of Convecting Material
8 According to the theory of plate tectonics, where do
activities such as earthquakes and volcanic eruptions occur?
A. in the centers of plates
B. along plate boundaries
C. in the outer regions of plates
D. in the inner core
SC.7.E.6.7 – Effects of Convecting Material
9
A glaciovolcano is a volcano covered by glaciers. When it erupts,
the glaciers covering it can melt. What is the most likely result of
such an eruption?
a flood
B. an earthquake
C. an avalanche
D. a tsunami
A.
SC.7.E.6.7
Effects of Convecting Material
7. B
8. B
9. A
Overall Summary:
Heat flow and the movement of material within the Earth can
have major impacts on the surface. Earthquakes, volcanic
eruptions, the creation of mountains and ocean basins are some
of these impacts. Most of these surface changes occur at plate
boundaries but not all. Hot spots are volcanoes found in other
locations of a tectonic plate.
Discussion?
SC.7.E.6.1 – Layers of the Earth
10 One layer of Earth is composed mainly of liquid iron and
nickel. This layer creates Earth’s magnetic field, which
protects Earth from solar wind. What is the name of this
layer of Earth?
A. The outer core
B. The mantle
C. The crust
D. The inner core
SC.7.E.6.1 – Layers of the Earth
11 What layer of Earth contains the plates that cause
earthquakes and volcanic eruptions?
A. The atmosphere
B. The inner core
C. The mantle
D. The crust
SC.7.E.6.1 – Layers of the Earth
12 The crust is the outermost layer of the Earth. What hot,
convecting layer of Earth lies under the crust?
A. The hydrosphere
B. The outer core
C. The mantle
D. The core
SC.7.E.6.1
The Layers of the Earth
10. A
11. D
12. C
Overall Summary:
There are, after combining the physical and mechanical
properties, four layers of the Earth. At the surface is the crust
which contains the tectonic plates. Below the crust is the mantle.
It contains the plastic-like material that moves around in currents
(convection.) Below the mantle is the outer core – it is liquid.
The final layer is the inner core which is solid.
Discussion?