Science Lesson 2: Collide, Move Apart, and Slide and Triangulation Method

Question 1

He proposed the continental drift theory.

Answer 1

Alfred Wegener

Question 2

It is also known as plate margins

Answer 2

Plate Boundaries

Question 3

Used to determine the epicenter by where it intersects

Answer 3

Triangulation Method

Question 4

Two continental crustal plates move toward one another

Answer 4

Continental-Continental

Question 5

Move apart from each other, outwards, tensional force

Answer 5

Divergent Plate Boundaries

Question 6

Uses seismic data collected from at least 3 different locations

Answer 6

Triangulation Method

Question 7

Causes one plate to subduct from the other

Answer 7

Oceanic-Oceanic

Question 8

Slide past horizontally, lateral, shearing force

Answer 8

Transform Plate Boundaries

Question 9

The point on the Earth’s surface vertically above the focus of an earthquake

Answer 9

Epicenter

Question 10

Produces new seafloor

Answer 10

Divergent Plate Boundaries

Question 11

Print out/display screen

Answer 11

Seismogram

Question 12

Relating to an earthquake vibration

Answer 12

Seismic

Question 13

Process at which oceanic crust sinks down the continental crust and goes back to the mantle

Answer 13

Subduction

Question 14

It is a line where large moving plates meet

Answer 14

Plate Boundaries

Question 15

Deep, narrow depression on the ocean seafloor caused by the collision and/or subduction of plates

Answer 15

Trench

Question 16

A depression or lowland region along the separation of plates

Answer 16

Rift valley

Question 17

Move towards each other, inwards, compressing force

Answer 17

Convergent Plate Boundaries

Question 18

Father of the plate tectonics theory

Answer 18

Alfred Wegener

Question 19

The denser oceanic crust move beneath the lighter continental crust

Answer 19

Oceanic-Continental

Question 20

Device that detects/measures seismic activity

Answer 20

Seismograph

Question 21

3 types of Plate Boundaries:

Answer 21

Divergent, Convergent and Transform Boundaries

Question 22

Time interval between the arrival of P-wave and S-wave

Answer 22

Lag Time

Question 23

Steps in Locating the Epicenter Using Triangulation Method

Answer 23

1. Obtain data from 3 seismic stations
2. Subtract arrival time of P and S wave.
3. Compute for the distance of the epicenter from each seismic station.
   (Time difference x 100/8)
4. Draw a circle around each seismic station using the distance as its radius.
5. The intersection part of the 3 circles is the earthquake’s epicenter.