Science Midterm

Front 1

Distribution of volcanoes

Back 1

occur at hot spots or convergent boundaries forming volcanic mountains or volcanic island arcs "Ring of Fire"

Front 2

Sea floor spreading

Back 2

magma rises at the mid-oceanic ridge, forming new crustal material and plates move apart

Front 3

Mid-oceanic ridge

Back 3

world's longest mountain chain, the rift valley running down the center of the ridge is the site of new plate growth

Front 4

Thickness of sediments on the ocean floor

Back 4

as you go from the mid-ocean ridge the sediments get thicker and older

Front 5

Subduction zones

Back 5

a denser oceanic plate goes under either a continental plate or another less dense oceanic plate to move into the mantle

Front 6

Trench

Back 6

surface feature of a subduction zone; deepest parts of the ocean

Front 7

Ancient mountain chain

Back 7

running from northeast South America to northwest Africa to eastern United States across central Scotland and into Scandinavia, this chain was considered evidence for continental drift and later plate tectonics

Front 8

Magnetic reversals

Back 8

used to show pattern of rock formation around mid-ocean ridges, reflected the reversal of magnetic north over millions of years; supported theory of plate tectonics

Front 9

Glacial evidence

Back 9

rock striations indicated a single continental glacier stretching over Africa, South America, and Madagascar, support for idea of continental drift and theory of plate tectonics

Front 10

role of sample size in density

Back 10

the amount of sample size does not affect density because it is calculated to be mass per 1 unit of volume

Front 11

rock

Back 11

naturally occurring, usually made of two or more minerals

Front 12

mineral

Back 12

crystalline structure, solid, naturally occurring, definite chemical makeup

Front 13

topographic map

Back 13

shows relief and surface structures of an area using contour lines

Front 14

fair test

Back 14

a repeatable procedure for manipulating only one variable in oder to answer a question

Front 15

floater

Back 15

an object or material which is less dense than the substance it is in, usually molten or a liquid