A general view shows the Popocatepetl volcano spews a cloud of ash high into the air as is pictured from a plane during a flight to Mexico City, Mexico October 18, 2019. REUTERS/Henry Romero? 

An aerial view shows the Popocatepetl volcano spewing a cloud of ash high into the air as is pictured from a plane during a flight to Mexico City, Mexico October 18, 2019. REUTERS/Henry Romero? 

Cows graze in a field in front of the Wildstrubel mountain and the Plaine Morte glacier, days ahead federal elections, in Lenk, Switzerland October 14, 2019. Picture taken October 14, 2019. REUTERS/Denis Balibouse 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 11, 2019. REUTERS/Cristobal Saavedra Escobar 

Lava is seen glowing inside the crater of the Nyiragongo volcano inside the Virunga National Park near the eastern Congolese city of Goma in the Democratic Republic of Congo, August 9, 2019.Picture taken August 9, 2019.REUTERS/Baz Ratner TPX IMAGES OF THE DAY 

Lava is seen glowing inside the crater of the Nyiragongo volcano inside the Virunga National Park near the eastern Congolese city of Goma in the Democratic Republic of Congo, August 9, 2019.Picture taken August 9, 2019. REUTERS/Baz Ratner 

Lava is seen glowing inside the crater of the Nyiragongo volcano inside the Virunga National Park near the eastern Congolese city of Goma in the Democratic Republic of Congo, August 9, 2019.Picture taken August 9, 2019. REUTERS/Baz Ratner 

Chinese and U.S. flags flutter near The Bund, before U.S. trade delegation meet their Chinese counterparts for talks in Shanghai, China July 30, 2019. REUTERS/Aly Song 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy July 27, 2019. Picture taken July 27, 2019. REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello TPX IMAGES OF THE DAY 

Mount Etna, Europe's highest and most active volcano, erupts in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts and lights up the sky in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello 

Mount Etna, Europe's highest and most active volcano, erupts in Sicily, Italy, June 1, 2019 REUTERS/Antonio Parrinello 

Lava erupts from a fissure east of the Leilani Estates subdivision during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S., May 13, 2018. REUTERS/Terray Sylvester SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY. 

Lava erupts from a fissure east of the Leilani Estates subdivision during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S., May 13, 2018. REUTERS/Terray Sylvester SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY. 

People watch from a tour boat as lava flows into the Pacific Ocean in the Kapoho area, east of Pahoa, during ongoing eruptions of the Kilauea Volcano in Hawaii, U.S., June 4, 2018. REUTERS/Terray Sylvester SEARCH "POY GLOBAL" FOR FOR THIS STORY. SEARCH "REUTERS POY" FOR ALL BEST OF 2018 PACKAGES. TPX IMAGES OF THE DAY. 

A general view shows Fuego volcano (Volcano of Fire) erupting as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria TPX IMAGES OF THE DAY 

Steam rises from Fuego volcano (Volcano of Fire) as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria 

Steam rises from Fuego volcano (Volcano of Fire) as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria 

A general view shows Fuego volcano (Volcano of Fire) erupting as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria 

A general view shows Fuego volcano (Volcano of Fire) erupting as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria 

A general view shows Fuego volcano (Volcano of Fire) erupting as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria 

A general view shows Fuego volcano (Volcano of Fire) erupting as seen from San Juan Alotenango, outside of Guatemala City, Guatemala November 19, 2018. REUTERS/Luis Echeverria 

The Villarrica Volcano is seen at night from Pucon town, Chile, Picture taken November 6, 2018. Picture taken November 6, 2018. REUTERS/Cristobal Saavedra Escobar TPX IMAGES OF THE DAY 

The Villarrica Volcano is seen at night from Pucon town, Chile, Picture taken November 6, 2018. Picture taken November 6, 2018. REUTERS/Cristobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile, Picture taken November 6, 2018. Picture taken November 6, 2018. REUTERS/Cristobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 24, 2018. Picture taken September 24, 2018. REUTERS/Cristobal Saavedra Escobar TPX IMAGES OF THE DAY 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 24, 2018. Picture taken September 24, 2018. REUTERS/Cristobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 24, 2018. Picture taken September 24, 2018. REUTERS/Cristobal Saavedra Escobar 

Anak Krakatau (Child of Krakatoa) volcano is seen from Japanese helicopter carrier Kaga at the Indian Ocean, Indonesia September 22, 2018. REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY 

Anak Krakatau (Child of Krakatoa) volcano is seen from Japanese helicopter carrier Kaga at the Indian Ocean, Indonesia September 22, 2018. REUTERS/Kim Kyung-Hoon TPX IMAGES OF THE DAY 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 14, 2018. REUTERS/Crisobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile September 13, 2018. Picture taken September 13, 2018. REUTERS/Crisobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile September 13, 2018. Picture taken September 13, 2018. REUTERS/Crisobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 2, 2018. Picture taken September 2, 2018. REUTERS/Cristobal Saavedra Escobar TPX IMAGES OF THE DAY 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 2, 2018. Picture taken September 2, 2018. REUTERS/Cristobal Saavedra Escobar TPX IMAGES OF THE DAY 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 2, 2018. Picture taken September 2, 2018. REUTERS/Cristobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 2, 2018. Picture taken September 2, 2018. REUTERS/Cristobal Saavedra Escobar 

The Villarrica Volcano is seen at night from Pucon town, Chile, September 2, 2018. Picture taken September 2, 2018. REUTERS/Cristobal Saavedra Escobar 

Lava streams down from Anak Krakatau (Child of Krakatoa) volcano during an eruption as seen from Rakata island in Lampung province, Indonesia, July 19, 2018. Picture taken July 19, 2018. REUTERS/Stringer TPX IMAGES OF THE DAY 

Lava streams down from Anak Krakatau (Child of Krakatoa) volcano during an eruption as seen from Rakata island in Lampung province, Indonesia, July 19, 2018. Picture taken July 19, 2018. REUTERS/Stringer TPX IMAGES OF THE DAY 

Lava streams down from Anak Krakatau (Child of Krakatoa) volcano during an eruption as seen from Rakata island in Lampung province, Indonesia, July 19, 2018. Picture taken July 19, 2018. REUTERS/Stringer 

Fire is seen on the slopes of Mount Agung volcano following an eruption, as seen from Amed in Karangasem Regency, Bali, Indonesia July 3, 2018. REUTERS/Johannes P. Christo 

Fire is seen on the slopes of Mount Agung volcano following an eruption as seen from Amed in Karangasem Regency, Bali, Indonesia July 3, 2018. REUTERS/Johannes P. Christo TPX IMAGES OF THE DAY 

Fire is seen on the slopes of Mount Agung volcano following an eruption as seen from Amed in Karangasem Regency, Bali, Indonesia July 3, 2018. REUTERS/Johannes P. Christo 

Fire is seen on the slopes of Mount Agung volcano following an eruption as seen from Amed in Karangasem Regency, Bali, Indonesia July 3, 2018. REUTERS/Johannes P. Christo 

Fire is seen on the slopes of Mount Agung volcano following an eruption as seen from Amed in Karangasem Regency, Bali, Indonesia July 3, 2018. REUTERS/Johannes P. Christo 

Mount Agung volcano erupts during the night, as seen from Datah village, Karangasem Regency in Bali, Indonesia on June 29, 2018. REUTERS/Johannes P. Christo TPX IMAGES OF THE DAY 

A motorist takes pictures of Mount Agung volcano erupting in Kubu, Karangasem Regency in Bali, Indonesia on June 29, 2018. REUTERS/Johannes P. Christo 

Mount Agung volcano erupts, as seen from Kubu, Karangasem Regency in Bali, Indonesia on June 29, 2018. REUTERS/Johannes P. Christo 

Mount Agung volcano erupts, as seen from Kubu, Karangasem Regency in Bali, Indonesia on June 29, 2018. REUTERS/Johannes P. Christo