Question

scientists can use infrared waves to monitor volcanoes! they use a device called a spectrometer. heres how it works.

infrared waves emitted from lava are absorbed by volcanic gases. each type of gas absorbs unique wavelengths of infrared waves. a spectrometer positioned above the volcano measures these wavelengths. then, these measurements are used to identify the types of gases emitted by a volcano. monitoring volcanic gases helps scientists predict the likelihood of a volcanic eruption.

spectrometer above the overlook vent in halemaumau crater in hawaii

complete the sentences.

volcanic gases absorb infrared waves that are ______ from lava. a spectrometer measures the wavelengths of these infrared waves to determine the types of gases emitted by the volcano.

options: emitted, absorbed, released

Explanation:

The text states "Infrared waves emitted from lava are absorbed by volcanic gases." This directly provides the missing term for the sentence.

Answer:

Volcanic gases absorb infrared waves that are emitted from lava. A spectrometer measures the wavelengths of these infrared waves to determine the types of gases emitted by the volcano.