7th grade Ch. 1 Sec. 1 Earth's InteriorPresentation Transcript
Ch. 1 Sec. 1 Earth’s Interior
Activity pg. 6 - How do Scientists Find Out What’s Inside Earth?
Without opening the canisters, what differences do you notice between them?
Apart from their appearance on the outside, are the canisters similar in any way?
How did you obtain this evidence?
Canister Observations 1 2 3
direct evidence from rock samples
indirect evidence from seismic waves- earthquakes
geologists use 2 types of evidence to learn about Earth’s interior
Layers of Earth 3 main layers of Earth’s interior crust mantle
The crust is a layer of solid rock that includes both dry land and the ocean floor.
layer of rock
forms Earth’s outer skin
2 types of crust :
made of basalt- dark rock w/ fine texture
made of granite - rock w/ light color & coarse texture
Earth’s mantle is made up of rock that is very hot, but solid. Scientists divide the mantle into layers based on the physical characteristics of those layers.
layer of hot solid rock
from base of crust 3,000 km deep
2 parts of mantle:
rigid layer of uppermost part of mantle & crust
floats on top of 2. asthenosphere
soft layer that flows
2 parts :
inner core- solid
outer core- liquid
currents in liquid outer core force solid inner core to spin produces Earth’s magnetic field
made of iron & nickel
Creating Data Tables pg. 11 Depth Name of Layer What Layer Is Made Of 20 km 150 km 2,000 km 4,000 km 6,000 km
How to make a model of the
In a Ziploc bag, combine 1/2 cup (1 bottle) of glue and 1/2 cup of warm water.
Add a few drops of food coloring to tint the mixture to the desired shade.
In a second Ziploc bag, combine 1 teaspoon of Borax and 1/2 cup of water. Mix thoroughly.
Pour the Borax mixture into the glue mixture. It will be very thick.
Knead slightly as the mixture starts to come together.
ASTHENOSPHERE -SOFT LAYER OF THE MANTLE ON WHICH THE LITHOSPHERE FLOATS
Write a description of each layer of Earth.
Crust= graham crackers Mantle= black cherry Jello Outer core= peach Jello Inner core= raspberry Jello
Write a story about a journey to the center of Earth. Directions are on pg. 13 in your textbook.
1-2 written pages + 1 page with a picture
Have a beginning, middle and end to your story
You must include at least 3 facts for each main layer (composition, depth, thickness, how the layers are separated into different layers,etc.)
Activity: Core of the Matter
Build a 3-D model of the planets to depict the interiors of each. Punch a hole in a paper plate and spin it on a phonographic record player at 77 rpm. With different colored markers, draw the layers of the planet to correspond in scale to the planet’s interior. For example, for a simplified earth draw to scale a core, a mantle, and a crust. Repeat this on both sides of three plates. (On some turntables, an upside down plate will override the rotating section. To get a plate to spin upside down, first place a spare plate right-side-up on the player, then place the upside down plate on that.)
Cut and combine the plates so the three of them intersect perpendicular to each other on an X-, a Y-, and a Z-axis. To do this, cut a slit halfway across two plates and intertwine them. Cut a third plate in half. On each half cut a slit from the cut edge (what was formerly the center of the plate) halfway outward. Cut partial slits on the combined plates to accommodate the two halves. Hang and shabang.