TOPSHOT - This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

Mount Etna, Europe???s most active volcano, spews ash and lava, Tuesday, Feb. 16, 2021. Mount Etna in Sicily, southern Italy, has roared back into spectacular volcanic action, sending up plumes of ash and spewing lava. (Davide Anastasi/LaPresse via AP)

Mount Etna, Europe???s most active volcano, spews ash and lava, Tuesday, Feb. 16, 2021. Mount Etna in Sicily, southern Italy, has roared back into spectacular volcanic action, sending up plumes of ash and spewing lava. (Davide Anastasi/LaPresse via AP)

Lava gushes from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Lava gushes from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Lava gushes from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Lava gushes from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Lava gushes from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Smoke billows from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Lava gushes from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Smoke billows from the Mt Etna volcano near Catania, Sicily, Tuesday, Feb. 16, 2021. Europe's most active volcano came alive around 4 pm local time on Tuesday, according to the Italian Institute of Geophysics and Volcanology. (AP Photo/Salvatore Allegra)

Mount Etna, Europe???s most active volcano, spews ash and lava, as seen from Catania, southern Italy, Tuesday, Feb. 16, 2021. Mount Etna in Sicily, southern Italy, has roared back into spectacular volcanic action, sending up plumes of ash and spewing lava. (Davide Anastasi/LaPresse via AP)

Smoke billows from Mount Etna, Europe???s most active volcano, Tuesday, Feb. 16, 2021. Mount Etna in Sicily, southern Italy, has roared back into spectacular volcanic action, sending up plumes of ash and spewing lava. (Davide Anastasi/LaPresse via AP)

This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

TOPSHOT This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

This photo obtained from Italian news agency ANSA shows the Etna volcano in Catania, Sicily, on February 16, 2021 during a spectacular eruption and a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south. (Photo by Handout / ANSA / AFP) / Italy OUT

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM

A spectacular eruption is underway on Etna volcano with a strong explosive activity from the south-east crater and the emission of a high cloud of lava ash that disperses towards the south, Sicily island, southern Italy, 16 february 2021. From the same 'mouth' a lava overflow emerges which produced a modest collapse of the side of the cone, generating a pyroclastic flow that developed along the western wall of the Valle del Bove. Catania, Sicily, Italy, February 16, 2021. Photo by Angela Platania/Fotogramma/IPA/ABACAPRESS.COM