the crust varies from around from what thick in the ocean floor and continental crust?

This is the outside layer of the earth

The crust is made of what material?

what makes oceanic crust denser?

outermost layer of the earth

surface of the earth

the mantle lies below the crust is up to what km thick?

It is consist of hot, dense, iron and magnesium rich solid rock?

what is the 4 layers of mantle?

it is made up to iron and nickel

the inner core is so deep within the earth that it’s under?

it is less dense, thicker, and mainly composed of granite

on the land where we live

what is the temperature of outer core?

The outer core is important to earth as it creates something called?

define ground shaking caused by the sudden release of energy in earth’s crust?

what is the other term of earthquake?

what wave that the earthquake creates?

it is used to describe any seismic event whether a natural phenomenon or event cause by humans

3 types of earthquake

caused by the sudden slippage along a fault or line of dislocation in the outer part of the earth

associated with volcanic eruption or subterranean movement of magma

deep earthquake with what focal depths?

Artificially induced earthquake

the theory of continental drift is most associated with whom?

in what century that the continental drift published?

this theory explains that the continental landmasses were drifting

Wegener was convinced that all of earth’s continents were once part of an enormous, single landmass called?

Theory of plate tectonics came from the latin word

theory of plate tectonics came from ancient greek tektovikos means?

It is a scientific theory describing the large scale motion of seven large plates and the movements of a larger numbers of smaller plates

tectonic processes began on earth between what year

what are the 4 plate boundaries?

occur when two plate slide apart from each other.

at what zone does fge divergent b pi boundaries occur?

it is formed by seafloor spreading, allowing for the transformation of new ocean basin

occur when two plates slide towards to from either a subduction zone

it is also called continental collision

occur when two lithospheric plates slides, or perhaps more accurately, grind past each other

occur at subduction zones at destructive plate boundaries

what is the famous fault in the world?

fracture on earth’s crust or breaks in rocks along which there is displacement of rocks on one side relative to the order

when 2 ground masses move with respect to one another

this occurs on an approximate vertical fault plane as the rock on one side of the fault slide horizontally past the other

this oocurs when the fault is at an angle to the surface of the earth and the movement of the rocks is up or down

the hanging wall moves down and the foot wall moves up when the relative movement is in an upward and downward direction on a nearly vertical fault plane.

hanging wall moves up and the foot wall moves down

occurs along convergent boundaries

the fault plane lies at a low angle to the earth’s surface

thrust fault is when the earth is under of what stress?

the thrust fault that does not extend all the way of earth’s surface.

Many earthquakes are caused by movement on faults that have components of both dip slip and strike slip

crack or fracture in the earth’s crust that occurs due to the release of accumulated energy

faults commonly forms in what?

is the plane that represents the fracture surface of a fault

is a place where the fault can be seen or mapped on the surface

is the block above the fault plane

is the block below the fault plane

is the trend of the line formed by intersection of a fault plane and a horizontal plane, such as the ground surface or a map surface

is the angle between a horizontal surface and fault plane

dip literally means

happens when the earth’s crust completely breaks and slides paet each other

rocks along a fault tend to move in opposite directions

it results in the formation of block mountains and river valleys

what are the types of fault

what are the 3 stresses that relates to types of faulting

it is a type of forces that pull the rocks apart

is a type of stress that causes the rocks to push or squeeze against one another

types of compression stress that the crust can thicken or shorten

type of compression stress that the crust can thin out or break off

type of stress that the force of the stress pushes some of the crust in different directions

the philippines is situated in a tectonically active region called

the archipelago is surrounded by subducting tectonic plates, what are the two plates

one explanation for why we experience several destructive quake is the existence of?

how far does the tectonic feature (philippine fault zone) that runs across the country

the philippine fault zone starts from and ends in?

used to describe an area where earthquakes tend to focus

the boundaries of the plates are the weak zones where earthquakes are more likely to occur it is also known as

these are the areas that least prone to earthquakes or seismic activity

these are the areas that experience very little ground acceleration

these are the areas that are experience some ground acceleration

these are the areas near active fault lines that are most prone to earthquake or seismic activity

what are the two seismic zone in the Philippines

what provinces covers the zone 2

what are the zone 4

describes an area with particular level of hazard due to earthquakes

is a service institute of the DOST

DOST-PHIVOLCS operates and maintains of how many networks?

it detects and measure earth’s ground motion

utilizes sensitive seismographs to record the ground motion from seismic waves created by earthquakes or other sources

can be used to determine the location, origin time, and magnitude

what is the average of earthquakes are recorded daily in the philippines

an instrument that detects earthquakes

where are the major fault lines in the philippines

what are the most notable fault lines in the philippines