Question

7 fill in the blanks to complete the sentences. not all the words will be used.
from the sun travels to earth through
waves, which can move across empty space.
ocean waves are waves that travel through water as a
.
earthquakes cause waves that travel through
in the ground.
word options: seismic, mechanical, energy, medium, matter, electromagnetic, molecule

Answer:

First Sentence:

• The first blank: The Sun emits "energy" (in the form of electromagnetic radiation) that travels to Earth. So the first blank is "energy".
• The second blank: Energy from the Sun travels as "electromagnetic" waves (since electromagnetic waves don't need a medium and can travel through empty space). So the second blank is "electromagnetic".

Second Sentence:

• The first blank: Ocean waves are "mechanical" waves (they require a medium, like water, to travel). So the first blank is "mechanical".
• The second blank: The medium for ocean waves is "water" (but from the given words, the relevant medium - related word here is "medium"? Wait, no, the words given are mechanical, energy, medium, matter, electromagnetic, molecule. Wait, ocean waves travel through water as a "medium"? Wait, the second blank in the second sentence: "Ocean waves are mechanical waves that travel through water as a [blank]". The correct word here is "medium" (since a medium is the substance through which a wave travels). Wait, but let's check the words. The words available are mechanical, energy, medium, matter, electromagnetic, molecule. So for the second sentence: "Ocean waves are mechanical waves that travel through water as a medium." Wait, but maybe I made a mistake. Wait, the second sentence structure: "Ocean waves are [blank1] waves that travel through water as a [blank2]". Blank1: mechanical (since ocean waves are mechanical, need a medium). Blank2: medium (since water is the medium). But let's check the words. The words are: mechanical, energy, medium, matter, electromagnetic, molecule. So yes, blank1: mechanical, blank2: medium.

Third Sentence:

• The first blank: Earthquakes cause "seismic" waves? Wait, no, the given words are seismic? Wait, the left - hand side words: seismic, mechanical, energy, medium, matter, electromagnetic, molecule. Wait, the third sentence: "Earthquakes cause [blank1] waves that travel through [blank2] in the ground." Earthquakes cause "seismic" waves? But "seismic" is on the left. Wait, the left - hand words: seismic, mechanical, energy, medium, matter, electromagnetic, molecule. So first blank: seismic? Wait, no, the problem says "Not all the words will be used". Wait, maybe I misread. Wait, the third sentence: "Earthquakes cause [blank] waves that travel through [blank] in the ground." The waves from earthquakes are "seismic" (but "seismic" is a word on the left). Wait, the words on the left: seismic, mechanical, energy, medium, matter, electromagnetic, molecule. So first blank: "seismic" (but wait, the user's left - hand side has "seismic" as a word? Wait, the first word on the left is "seismic". Then the second blank: the medium for seismic waves is "matter" (since the ground is made of matter). So:

Filling the Blanks:

1. First sentence: "Energy from the Sun travels to Earth through electromagnetic waves, which can move across empty space."
2. Second sentence: "Ocean waves are mechanical waves that travel through water as a medium."
3. Third sentence: "Earthquakes cause seismic waves that travel through matter in the ground."

Wait, but let's check the words again. The words provided are: seismic, mechanical, energy, medium, matter, electromagnetic, molecule.

So:

• First sentence: "Energy from the Sun travels to Earth through electromagnetic waves, which can move across empty space." (Blanks: Energy, Electromagnetic)
• Second sentence: "Ocean waves are mechanical waves that travel through water as a medium." (Blanks: Mechanical, Medium)
• Third sentence: "Earthquakes cause seismic waves that travel through matter in the ground." (Blanks: Seismic, Matter)

But let's confirm the wave types:

• Electromagnetic waves: No medium needed, travel through vacuum (like space), correct for Sun's energy to Earth.
• Mechanical waves: Need a medium, ocean waves are mechanical (medium: water), correct.
• Seismic waves: Earthquake - generated, travel through the ground (which is matter), correct.

So the filled sentences are:

1. Energy from the Sun travels to Earth through electromagnetic waves, which can move across empty space.
2. Ocean waves are mechanical waves that travel through water as a medium.
3. Earthquakes cause seismic waves that travel through matter in the ground.