Eclipses & Tides: Alignment with Different Mechanisms — Practice · Grade 6 Science
Chapter: Earth, Moon, Sun & Space ModelsWhat this practice covers
By the end of Eclipses & Tides: Alignment with Different Mechanisms you should be able to:
- I can explain the geometry of a solar eclipse and a lunar eclipse.
- I can explain why eclipses do not happen every month.
- I can explain why there are two high tides a day rather than one.
8 questions, written answer and multiple choice, each with a worked explanation.
Vocabulary used: tidal range, eclipse, evidence, system boundary, uncertainty.
Problem 1
Answer and explanation
The Moon must also have the required alignment; the tilted orbit often carries it above or below the relevant line.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 2
Answer and explanation
Earth. The Moon enters that shadow; in a solar eclipse the Moon casts the relevant shadow on Earth.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 3
Answer and explanation
Local ocean shape, depth, movement, and timing affect the response, so a global sketch does not supply a safe local schedule.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 4
Answer and explanation
No. The term describes the alignment-related larger tidal range, occurring through the phase cycle rather than one season.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 5
Answer and explanation
The diagram represents a possible solar eclipse if alignment is exact. A’s range is 4.5 m and B’s 2.0 m. Tides involve gravitational effects, not a shadow lifting water. The table is fictional and cannot plan a real shore visit, and an alignment drawing does not guarantee an eclipse at every new phase.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 6
Answer and explanation
No. Full phase supplies the broad Sun–Earth–Moon arrangement, while orbital tilt can prevent the Moon entering Earth’s shadow.
Compare the scientific meaning and reasoning after an independent attempt. A different accurate supported response can be correct; human review is required.
Problem 7
- Ocean tides are caused by the Moon’s shadow.
- Every new or full phase must produce an eclipse.
- tidal range: The difference between high and low water levels using the same reference.
- One illustrative result establishes every real condition and needs no further evidence.
Answer and explanation
tidal range: The difference between high and low water levels using the same reference.
The difference between high and low water levels using the same reference. The diagram represents a possible solar eclipse if alignment is exact. A’s range is 4.5 m and B’s 2.0 m. Tides involve gravitational effects, not a shadow lifting water. The table is fictional and cannot plan a real shore visit, and an alignment drawing does not guarantee an eclipse at every new phase.
Problem 8
- One illustrative result establishes every real condition and needs no further evidence.
- Every new or full phase must produce an eclipse.
- Ocean tides are caused by the Moon’s shadow.
- eclipse: An alignment event in which one body blocks light or another enters a shadow.
Answer and explanation
eclipse: An alignment event in which one body blocks light or another enters a shadow.
An alignment event in which one body blocks light or another enters a shadow. The diagram represents a possible solar eclipse if alignment is exact. A’s range is 4.5 m and B’s 2.0 m. Tides involve gravitational effects, not a shadow lifting water. The table is fictional and cannot plan a real shore visit, and an alignment drawing does not guarantee an eclipse at every new phase.