Download DO NOT WRITE ON THIS PAPER Earth`s Layers Key Concepts

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Earth’s Layers
Unit 6
Lesson 3
Key Concepts
Choose the letter of the best answer.
1. Which compositional layer of Earth is the
thinnest?
A. the inner core
B. the outer core
C. the crust
D. the mantle
2. Earth has five layers based on physical
properties: the inner core, the outer core, the
mesosphere, the asthenosphere, and the
lithosphere. Which of these layers do the
tectonic plates move on top of?
A. outer core
B. lithosphere
C. mesosphere
D. asthenosphere
3. The innermost physical layers of Earth are the
inner core and outer core. Which two metals are
the inner and outer core mostly made of?
A. lead and iron
B. iron and nickel
C. lead and mercury
D. nickel and mercury
4. Evelyn is making a model of Earth to show how
the physical layers correspond to the
compositional layers. Which of the following
should Evelyn show in her model?
A. The physical layers exactly match the
compositional layers.
B. The crust is the only compositional layer not
included in the physical layers.
C. The physical layers of the inner core and
outer core form a single compositional layer.
D. The physical layer of the asthenosphere
includes the compositional layer of the crust.
5. Earth’s physical layers correspond to Earth’s
compositional layers. Which part of the mantle
is also part of the lithosphere?
A. the fluid, hot part
B. the rigid upper part
C. the soft moving part
D. the lower stationary part