Science L4 4th Qrt

Question 1

What is an opening on the the Earth’s crust through which hot molten rock flows out from deep inside the Earth?

Answer 1

Volcano

Question 2

What is a hot magma rock inside the Earth?

Answer 2

Magma

Question 3

Magma that reaches the surface of the Earth. What is this?

Answer 3

Lava

Question 4

What is the process that includes the movement of magma toward the surface of the Earth?

Answer 4

Volcanism

Question 5

How many are the potentially active volcanoes around the world?

Answer 5

1,500

Question 6

What occurs in belts that extend across continents and oceans?

Answer 6

Volcanoes

Question 7

What is a major volcanic belt?

Answer 7

Ring of Fire

Question 8

This comprises the many volcanoes that rime the Pacific Ocean. What is this?

Answer 8

Ring of Fire

Question 9

What is the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle?

Answer 9

Subduction

Question 10

What forms along the mid-ocean ridges, which mark spreading boundaries?

Answer 10

Volcanoes

Question 11

What are long, underwater mountain ranges that sometimes have rift valleys down their centers?

Answer 11

Ridges

Question 12

What is a deep valley along spreading boundary?

Answer 12

Rift valley

Question 13

Where may two oceanic plates collide?

Answer 13

Volcanoes

Question 14

What is a string of volcanic islands called?

Answer 14

Island arc

Question 15

This are the certain points within the mantle. What is this?

Answer 15

Hot spots

Question 16

When magma from the hot spot reaches the surface, a ___-____ _______ is formed.

Answer 16

Hot-spot volcano

Question 17

What is a volcano that had its last eruption more than 10 000 years ago and is not expected to erupt again in the foreseeable future?

Answer 17

Extinct volcano

Question 18

What may supply magma to two or more volcanoes simultaneously?

Answer 18

Hot spot

Question 19

What has many active volcanoes?

Answer 19

The Philippines

Question 20

It is a major zone of active volcanoes formed by subducting plates encircling the Pacific Ocean. What is this?

Answer 20

The Pacific Ring of Fire

Question 21

When magma from the mantle seeps through the crust, it forms within the crust a cavity called a _____ _______.

Answer 21

Magma chamber

Question 22

What is the main duct or hole through which magma exits the volcano?

Answer 22

Central vent

Question 23

What is a mountain or hill that forms the visible part of the volcano above the surface?

Answer 23

Volcanic cone

Question 24

What is the top of the central vent through which most of the magma exit?

Answer 24

Crater

Question 25

Magma seeps through the side of the volcanic cone forming ____ _____.

Answer 25

Side vents

Question 26

What is an underground rock layer where water is collected?

Answer 26

Aquifer

Question 27

What is a volcano that stops emitting heat, ash, and magma?

Answer 27

Inactive volcanoes

Question 28

The empty magma chamber is a hollow cave and it usually cannot support to collapse into a hole called _______.

Answer 28

Caldera

Question 29

When rain water fill up the caldera, it becomes a ______ ____.

Answer 29

Crater lake

Question 30

What occur when then pressure exerted by the surrounding rocks on magma decreases as magma moves upward to the surface?

Answer 30

Volcanic activity