School year 2008/2009 Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)

THE ATMOSPHERICAL
PRECIPITATIONS
di Cristiana Ricchiuti
3rd class
School year 2008/2009
Comenius project
Teacher: Roberta Conti
• This term is linked to a sequence of
weather phenomenon and
characterized by aggregation of
water molecules in liquid or solid
form which fall to the ground
because of the force of gravity.
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
Precipitations
• The rain is the most
common form of
weather
precipitations formed
by the condensation
of steam in separate
water drops which
fall to the ground
from clouds.
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
The Rain
• The snow is formed
by the sublimation
process (from
steam to ice) when
temperatures are
close to 0° C.
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
The Snow
• The snow may be
in crystal shape,
all hexagonally
symmetrical,
• or in flakes.
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
The Snow (2)
• The hail is a
precipitation formed
by many layers of ice
alternated to others
of melted and
refrozen snow
(hailstones).
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
The Hail
• The hoar-frost is a
sediment of granular ice,
that looks like crystal, in
the form of blades or
needles, formed by
defrosting of atmosphere
steam on poor heat
conductor bodies.
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
The Hoar-Frost
• The dew is a
precipitation which
appears on the soil
and on vegetation; it
usually forms during
the quiet and clear
nights, when the
steam condenses in
drops of water.
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
The dew
• ...to the English teacher, Maria
Spina Cinquina, for the corrections
of the translations.
• ...to all schoolmates, they gave me
the original photos of the various
precipitations.
• ...to everybody for your attention.
Cristiana Ricchiuti
School year 2008/2009
Comenius project
Ist. Comp. “Molise Altissimo” – Carovilli (ITaly)
Thanks...