1. evaporation: water from the earth's surface (sea, river, soil, plants) enters the atmosphere in the form of water vapor.<span class="jcahz"><span class="XXXXXX"&XX;&XX;/span&XX;</span>
2. XXXXXX air: XXXX XXX is XXXXXXX, so it rises.<span class="jcahz"&XX;&XX;span XXXXX="XXXXXX"&XX;</span>&XX;/span&XX;
X. XXXXXXX and condensation: XXXX XXX air rises, XXX temperature XXXXXXXXX and XXX water vapor turns XXXX tiny water XXXXXXXX or ice XXXXXXXX.
XXXXX XXXXXXXX together form clouds.<span XXXXX="jcahz"&XX;&XX;span XXXXX="XXXXXX"></span&XX;</span&XX;
clouds XXXX in XXXXXXXXXX XX XXXX humidity - cooling XX the XXX - XXXXXXXX XXXXXXXX XX XXX (XXXXXX)XXXXXXXXXXX instability.&XX;span XXXXX="XXXXX XXXXXX">&XX;span XXXXX="rynqvb">&XX;/span&XX;&XX;/span&XX;
the main XXXXX XX clouds XXX XXX conditions XXX their XXXXXXXXX:. &XX;span class="jcahz XXXXXX">&XX;span XXXXX="XXXXXX">XXXXXX clouds, XXXXX XXXX in XXXXXX and cold weather conditions at very high altitudes (XXXXX 6 XX). XXXXX XXXXX XX XXXX, XXXXXXXXXXX.</span&XX;</span>&XX;span XXXXX="XXXXX chmk0b">&XX;span XXXXX="rynqvb">XXX presence of XXXX type XX cloud is a XXXX XX good weather, XXX if they increase, it XX a XXXX of possible XXXXXXX changes in the future.&XX;/span></span>&XX;span XXXXX="XXXXX XXXXXX"&XX;<span XXXXX="XXXXXX">&XX;/span>&XX;/span>
2. cumulus XXXXXX, which are XXXXX like XXXXXX XXX XXXX XX XXXXX XXXX when the earth's XXXXXXX warms up. &XX;span class="jcahz XXXXXX">&XX;span class="XXXXXX">these clouds XXX a XXXX of good weather and XX XXXX XXXX, they may XXXX XXXX a storm.&XX;/span&XX;&XX;/span&XX;
3. XXXXXXX XXXXXX, which XXX XXXXXXX and gray in XXXXX and XXXXXX weather XXXXXXXXXX XXX are a sign of a completely cloudy sky and XXXXX rain or fog.<span XXXXX="XXXXX XXXXXX">&XX;span class="XXXXXX">&XX;/span>&XX;/span>
4. XXXXXXXXXXXX clouds, which are XXXX XXXX XXX XXXXXXXX in shape and are XXXXXX in unstable weather XXXXXXXXXX XXXX high humidity and XXXXXXX XXXXXXX XXX are a sign of XXXXXX, lightning, heavy XXXX, XXXX