 Notes 2.1 Earth: A unique Planet
Three Unique Characteristics
 There is liquid ______________ on its ________________.
 There is a large portion of _______________ in the _____________________.
 It is the ____________known planet to support _______________.
Earth Basics
 Earth is the_____________ planet from the _________.
 The earth is approximately ____________________________ years old.
 There is a ______________ ocean. About _____________ of the surface of Earth
is covered in _______________.
 The earth’s shape is an _______________ spheroid.
 It _____________ at the ________________.
 The pole to pole circumference is ___________________.
 The equatorial circumference is _____________________.
 The earth has a relatively ________________ surface.
 The Earth’s diameter is _______________________.
Earth’s Interior
 We have _________________ methods for _____________________.
 _______________________, but it’s limited to a few _______________.
 We have indirect methods of observation
 ________________________________ are vibrations that
_______________through the Earth and help us determine the Earth’s
__________________.
 There are three compositional zones of the Earth:
__________________________________________________________.
 There are five structural zones of the Earth:
__________________________________________________________________
__________________________.
The Three Compositional Zones
 The Crust – Makes up _________ of the Earth’s ____________.
 Composition: ______________________________
 Oceanic Crust – Under the _______________ ( ___________ Km)
 Mantle – Makes up the ______________________ (_______________Km)
 The crust is part of the ______________________.
 The Mantle – Makes up about _______ of the Earth’s ____________.
 Composition:____________________________
 The mantle is ________________ than the crust.
 It’s about _________________ Km thick.
 It’s composed of the_________________, asthenosphere, and the
________________________.
 The core - Makes up about _______________ of the earth’s ___________.
 Composition:_______________________
 It’s radius is ______________Km
 There are two parts; an ______________ core and an _______________ core.
The Five Structural Zones
 Lithosphere (made up of _______________ and _____________)
 “litho” = __________ or stone
 The lithosphere is solid and ________________.
 Asthenosphere ( __________________).
 “aestheno” = weak or _______________.
 It is solid but has ___________________, meaning it _____________.
 This is what allows ________________ plates to _________________.
 Mesophere (__________________)
 “meso” = _________________
 This layer is ________________ and __________________.
 Outer Core ( made of __________________ and _____________)
 The outer core is a ______________ __________________.
 Inner Core ( made of __________________ and _____________)
 The inner core is dense, _____________ and ________________.
The Magnetosphere
 magnetic field around the earth is called the ___________________
 movement of __________________ in Earth's iron core produce
________________ which creates Earth's magnetic field
 The earth has a ____________________ field generated by _______________
 Created by an ______________ current in the core
   motion of _______________ in the outer core created by

the ____________of the earth

_____________ difference in the core

the liquid outer core contains ____________________ (ions)
   ________________ are created by the motion of charged particles
  magnetic fields run ________________ to electric current
distorted by _________________ (charged particles from the sun)
Newton’s Law of Gravitation
 ________________ = the ____________ of attraction that exists between all
______________ in the universe.
 Law of _________________ = the force of ______________ between ________
objects
 depends on the _________________ of the objects and the
______________________ between them.
 A ________________ mass and _______________ increase gravity.
 Equation:
 Mass has _________________. (measure of the ________________ of the pull of
___________on an object; measured in Newton’s).
 Depends on the _____________ from the Earth’s __________________.
 You would weigh ______________ at the _____________ Pole than you would at
the _____________________.
 The force of ________________ decreases as the ____________________ from
the earth’s center ____________________