1.- WATERFALL
2.- VALLEY
steep
descent
water
stream
Niagara
4.- CAVE
underground
chamber
open
surface
storage
7.- HILL
rounded
natural
elevation
lower
mountain
range of hills
between
depression
earth
surface
3.- CLIFF
steep
vertical
rock
earth
ice
5.- FOREST
dense
growth
trees
animals
used for game
8.- SHORE
land
to border
beach
coast
water
6.- PATH
trodden way
track
walk
cycle
way
9.- TRUNK
tree
branches
root
part
main
10.- ROOT
part
tree
limbs
trunk
under
11.- BRANCH
part
tree
trunk
root
fruit
13.- BLOSSOM
flower
appear
before
fruit
tree
16.- FOREST FIRE
light
flame
heat
summer
element
12.- LEAF
green
fruit
foliage
photosynthesis
plant
14.- LAKE
inland body
standing water
energy
boat
flood
17.- FLOOD
rising
overflowing
water
natural disaster
quantity
15.- DESERT
arid
land
sparse
vegetation
Sahara
18.- HURRICANE
cyclone
winds
western Atlantic
thunder
lightning
19.- DROUGHT
period
dryness
crops
desert
growth
20.- TORNADO
22.- EARTHQUAKE
shaking
trembling
earth
volcanic
tectonic
warming
atmosphere
solar ratiation
heat
planet
23.- TIDAL WAVE
25.- GREENHOUSE EFFECT
violent
tropical
windstorm
whirling wind
funnel-shaped cloud
21.- VOLCANO
high
sea wave
earthquake
to trigger
water
24.- WEATHER
26.- OZONE LAYER
atmosphere
radiation
ultraviolet
global warming
hole
lava
rock
steam
hill
mountain
forecast
the news
atmosphere
sunny
map
27.-GLOBAL WARMING
ozone layer
to increase
temperature
greenhouse effect
pollution
28.- ACID RAIN
precipitation
pesticides
crops
pollution
to lose
29.- RADIATION
31.- CROPS
grow
harvest
profit
subsistence
plant
34.- UNLEADED PETROL
lead
contain
type
cars
fuel
solar
energy
waves
particles
emission
30.- DEFORESTATION
32.- EXHAUST FUMES
cars
pollution
CO2
gas
smoke
33.- PESTICIDES
35.- RENEWABLE ENERGY
solar
natural resources
wind power
hydropower
geothermal
forest
trees
clearing
to sell
fuel
to protect
crops
pests
destroy
poison
36.- FACTORY
building
facilities
manufacturing
machines
workers