6th science ch 3.1-3.4 page 125-144

type of weathering causes when natural acids slowly eat into a rock and break it apart

these may occur periodically for days or even months after a major earthquake

teh sudden movements of the Pacific plate under the ocean floor also cerated monstrous waves called

a huge bowl shaped depression formed when an empty magma chamber collapses after a volcanic eruption

scientist who study earthquakes

The process that causes rocks to gradually break or crumble into smaller pieces

this volcano is called teh lighthouse of the mediterranean; erupts on average every 20 minutes

Seismic belts are where most earthquakes occur

When the edge of on eplate is being forced beneath the edge of another is creates a ____

A weak earthquake is referred to as

The study of the earth and its structure is called

when lava fragments solidify almost instantly into fragments of rocks this is called

sand and mineral fragments

a dormant volcano is one that has recently erupted or considered likely to erupt in the near future

What type of volcano

As the plates drift apart, they create a gap, or ___ which is quickly filled by molten rock rising from below

The __ of an earthquake is the place at ground level that is directly above the focus

A magma chamber is a large reservoir a few miles beneath the earth's surface that contains magma

an erruption that occurs when a volcano expels hot clouds of gas and dust high into atmosphere

the study of earthquakes is called

type of volcano that is formed when alternating layers of fluid lava and tephra build up a steep symetrical mt

Scientist who study the structure of the earth

this type of volcano forms when large amounts of fluid, runny lava gradually build up a dome-shaped mountain

What type of volcanoes is this

The most famous scale used to measure earthquake strength

a vertical geyser of lava is called

after reaching the earth's surface, molten rock is called

layer that consists of molten iron and nickel in the liquid form

a depression at the top of a volcano is called a

larger fragments of tephra (over 2 1/2 inches) are called

Magnitude is the strength of an earthquake

What type of volcano

Most earthquakes occur where there are no fault lines established

A rock formation formed when rocks bends without cracking

the smallest fragments of tephra are called

the earth's oceans contain underwater mountain ranges called

the vent, which releases the pressure from the magma chamber is what we call a

the innermost layer of the earth

a volcano that has not erupted in recorded history or are unlikely to ever erupt again are called

Beneath the earth's crust lies the ____, the middle layer of the eart

because cinder cone volcanos are composed of loose materials they tend to grow larger than other volcanos

a hole or crack in the ground that serves as an escape vent for underground gases

the outermost layer of the earth is called

an opening caused by trapped gases that blast their way through the earth's surface

Most of the United states is located on which plate

Mass of hot metal, but remains in solid state because of the much greater pressure upon it

the break that apears at the boundary between two moving masses of rock

melted rock inside the earth

takes place when rock is broken down by water, ice, or windblown sand

formed by eruptions composed mostly of tephra or small fragments of solidified lava

The point underground where an earthquake begins

a mixture of broken down rocks and decomposed plants and animals

a dormant volcano is one that hasn't erupted in many years and is now considered inactive

fragments smaller than bombs but bigger than ash

the volcanic belt that encircles the edge of the Pacific ocean

a rock formation formed when rocks cracks but does not move in any way

Earthquakes occur from 2 plates in contact pushing against each other withforce as they move in different directions

the boundary between the earth's crust and mantle is called

the earth's crust is made of several individual ___ that flat like rafts on teh soft rock of the upper mantle

any trembling or shaking of the earth's crust is called

about 80% of earthquakes occur in teh Circum-Pacific belt

part of the earth's core that is solid

if lava erupts from a long crack or fissure instaed, it may produce a sheetlike fountain of glowing lava

___ is essential for all plant life.

the famous fault in southwestern California has been known for several well known earthquakes

type of erruption in which a volcano produces a large amount of fluid lava that surges from the volcanos vent