Question

spectrometer above the overlook vent in halemaumau crater in hawaii
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.
complete the sentences.
volcanic gases infrared waves that are from lava. a
spectrometer measures the of these infrared waves to determine the
types of gases emitted by the volcano.

Explanation:

From the given text: "Infrared waves emitted from lava are absorbed by volcanic gases" tells us the first two blanks: volcanic gases absorb infrared waves that are emitted from lava. Then, "A spectrometer positioned above the volcano measures these wavelengths" tells us the third blank: a spectrometer measures the wavelengths of these infrared waves.

Answer:

Volcanic gases $\boldsymbol{\text{absorb}}$ infrared waves that are $\boldsymbol{\text{emitted}}$ from lava. A spectrometer measures the $\boldsymbol{\text{wavelengths}}$ of these infrared waves to determine the types of gases emitted by the volcano.