The Origin of Petroleum

Question 1

gaseous

Answer 1

consisting of gas or gases, or like gas

Question 2

substance

Answer 2

material with particular physical characteristics

Question 3

sedimentary

Answer 3

(of rock) made from sediment left by the action of water, ice, or wind

Question 4

sediment

Answer 4

a soft substance that is like a wet powder and consists of very small pieces of a solid material that have fallen to the bottom of a liquid

Question 5

principal

Answer 5

first in order of importance

Question 6

clay

Answer 6

thick, heavy soil that is soft when wet, and hard when dry or baked, used for making bricks and containers

Question 7

shale

Answer 7

a type of soft, grey rock, usually formed from clay that has become hard, that breaks easily into thin layers

Question 8

compound

Answer 8

a chemical that combines two or more elements

Question 9

decomposition

Answer 9

the action of decaying, or causing something to decay

Question 10

decay

Answer 10

to become gradually damaged, worse, or less; to cause something to do this

Question 11

possess

Answer 11

to have or own something, or to have a particular quality

Question 12

derive

Answer 12

to get something from something else

Question 13

reservoirs

Answer 13

a place for storing liquid, especially a natural or artificial lake providing water for a city or other area

Question 14

analogous

Answer 14

having similar features to another thing and therefore able to be compared with it

Question 15

squeeze

Answer 15

to press something firmly, especially from all sides in order to change its shape, reduce its size, or remove liquid from it

Question 16

readily

Answer 16

quickly, immediately, willingly, or without any problem

Question 17

permeable

Answer 17

If a substance is permeable, it allows liquids or gases to go through it

Question 18

Hence

Answer 18

that is the reason or explanation for

Question 19

fasten

Answer 19

to (cause something to) become firmly fixed together, or in position, or closed

Question 20

grain

Answer 20

a very small piece of a hard substance

Question 21

porous

Answer 21

Something that is porous has many small holes, so liquid or air can pass through, especially slowly

Question 22

glide

Answer 22

to move easily without stopping and without effort or noise

Question 23

segregated

Answer 23

kept separate from something else

Question 24

encounter

Answer 24

to experience a situation, especially something that is unexpected or unpleasant

Question 25

controversial

Answer 25

causing disagreement or discussion

Question 26

barrel

Answer 26

a large container, made of wood, metal, or plastic

Question 27

accumulate

Answer 27

to collect a large number of things over a long period of time

Question 28

intensive

Answer 28

involving a lot of effort or activity in a short period of time

Question 29

estimate

Answer 29

to guess or calculate the cost, size, value, etc. of something

Question 30

basin

Answer 30

container