Earth Science-Earth A Unique Planet

Which is not a reason Earth is unique?

• has liquid water on its surface

• atmosphere contains a large proportion of oxygen

• only planet that we know of that supports life

• has 2 moons

Earth is the third planet from the sun, was formed 4.6 billion years ago and is made mostly of rock.

• True

• False

The shape of Earth is

• a perfect sphere

• oblate spheroid

• oval

• round

Vibrations that travel through Earth are called

• electromagnetic waves

• seismic waves

• transverse waves

• longitudinal waves

What is the outermost layer of the Earth called?

• mantle

• crust

• inner core

• outer core

The Earth's crust makes up about what percentage of the Earth's mass?

• 1%

• 10%

• 25%

• 50%

What are the two types of crust? (Select 2 answers)

• oceanic

• artic

• equator

• continental

The outer boundary of the crust is named after its discoverer

• Mohorovicic or Miho

• Mohorovicic or Moho

What is the layer that is below the crust, denser, and makes up 2/3 of the Earth's mass?

• inner core

• outer core

• mantle

• sphere

What is the center of the Earth is called

• core

• sphere

• equator

• interior zone