Chapter 2 Flashcards
Star that is 109 times wider than the earth
Sun
The sun and all objects in that revolve around it
Solar system
_____________ of the sun is created by its mass and keeps its objects revolving around it
Gravitational pull
All planets except ___ are grouped into two types
Pluto
Solid, rocky crusts; Mercury, Venus, earth, Mars
Terrestrial
more gaseous and less dense; Jupiter, Saturn, Uranus, Neptune
gas giant planets
ball of ice and rock
Pluto
small planet-like objects; found mainly between Mars and Jupiter
asteroids
bodies of dust and frozen gases
comets
space debris; pieces of rock and iron
meteoroids
how far is earth from the sun?
93 million miles
earth’s diameter is _____ miles at the equator, and ___ at the poles
7,930 - shorter
the circumference of earth is ____
24,000 miles
how much of earth’s surface is water
70%
oceans and other bodies of water
hydrosphere
earth’s crust; land above and below the ocean
lithosphere
part of the earth that supports life
biosphere
air that we breathe
atmosphere
the atmosphere is made up of ___ nitrogen
78%
the atmosphere is made up of ___ oxygen
21%
the atmosphere is made up of __ argon and other gases
1%
the atmosphere extends about ___ miles above earth’s surface
6,000
natural features of earth’s land
landforms
four major types of landforms can be be described by their ___ and ____
shapes - elevation
what are the four major types of landforms
mountains, hills, plateaus, plains
what two continents stand alone?
Australia - Antarctica
what continents are connected?
Asia, Europe, Africa,
North America and South America
part of a continent that extends underwater
continental shelf
the continental shelf can extend out to __ miles and be about ___ feet deep
800 - 600
what is the highest peak on earth?
Mount Everest
what is the lowest point on earth
shore of the Dead Sea
what is the deepest part on earth?
Marianna’s trench
