Theory:

Meaning of difficult words from the lesson "The Desert":
  
S.No
Words
Meaning
 1.
Region
A large area of a land, usually without exact limit 
   2.  
Precipitation
A form of water from the atmosphere 
 3.
Vegetation Plants that grow in a particular environment
 4. 
Misconception A belief or idea that is not based on a correct information
5.
AssumptionA belief that something is true without any proof
6.
TropicalVery hot and humid
7.
OasisAn area in the desert with water, where plants can grow
8.
AdaptTo change something in order to survive in a new situation
9.
AmidstIn the middle of something
10.
Spring
A natural flow of groundwater
11.
Hillock
A small hill
12.
Arid
A dry place without much plants
13.
DuneA hill of sand on a desert or beach
14.
HeapA large pile of something
15.
Survive To continue to live in a dangerous or difficult situation
16.
Adverse
Unfavourable or harmful
17.
Succulent
Having thick, fleshy leaves or stems adapted to store water
18.
Consume To eat or drink something
19.
Burrow A hole or tunnel dug by a small animal
20.
MoistureSmall drops of water or other liquid in air
21.
FeatureSomething important or noticeable
22.
BlanketA thick layer or cover of something
23.
Rapidly Very quickly
24.
ShallowNot deep
25.
Safeguard To protect something from harm or danger
26.
Widespread Existing over a large area
27.
DenseContaining a lot of people, things, plants etc. in a little space
28.
ExtractionThe process of obtaining or removing something from something else
29.
Crucial Extremely important