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.

infrared waves are ▼ by lava and then are ▼ by volcanic gases. a spectrometer measures the ▼ of these infrared waves to determine the types of gases emitted by the volcano.

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Explanation:

The text states lava emits infrared waves, which are then absorbed by volcanic gases. A spectrometer measures the unique wavelengths of these waves to identify gas types.

Answer:

Infrared waves are emitted by lava and then are absorbed by volcanic gases. A spectrometer measures the wavelengths of these infrared waves to determine the types of gases emitted by the volcano.