Theory:

Meanings of difficult words from the lesson "Fire: Friend and Foe":
 
Sl. No.
Words
Meanings
1
Early man Early human beings; precursors of the human race in its present form
2
FrightenedScared
3
Puzzled Confused
4
Chemical reactionA process that leads to the chemical transformation of one set of chemical substances to another
5
SmoulderingThe process of burning slowly with smoke but no flame
6
FlashpointThe lowest temperature at which the material burns in air
7
KindlingStimulating
8
ServantAs in someone (or something) who is there to help you with daily chores, usually someone who is under your control or below your rank
9
MasterA person (or a thing) who has complete control of something
10
Generate Produce
11
Damaged Destroyed
12
Vast
Of very great extent or quantity
13
Put outSwitch off
14
SmotheredExtinguish a fire by covering it
15
Damp Something which is wet
16
Extinguish Cause a fire or light to stop to burn or shine
17
AppliancesDevices
18
Human chain A line of people formed for passing things quickly from one site to another
19
BlazeFire
20
FiremenFire fighters; people who are trained to deal with fire accidents and disasters
21
NormsA standard or pattern, especially of social behaviour, that is typical or expected
22
EquipmentThe necessary items for a particular purpose
23
BrigadeAn organization with a military or quasi-military structure
24
Possess
Contain
25
Knockdown Breaking down a thing using the physical strength
26
GraduallySlowly
27
FoeEnemy