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Step-by-step solution for: Earth Science Worksheets PDF: Complete with ease | airSlate SignNow
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Step-by-step solution for: Earth Science Worksheets PDF: Complete with ease | airSlate SignNow
It looks like you've uploaded a worksheet titled "Earth Science 11 Unit 1 Worksheet", which contains a series of fill-in-the-blank questions related to Earth science concepts such as constellations, Earth's rotation, celestial coordinates, and star magnitudes.
Since I can't view images directly, I’ll need you to either:
1. Type out the questions from the worksheet so I can help solve them.
2. Or describe the content of the image in detail.
However, based on your description and the visible text in your message, I can already see the first 18 questions listed. Let me go through them one by one and provide correct answers with explanations.
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1. Constellations are groups of _________.
✔ Answer: Stars
➡️ *Explanation:* A constellation is a group of stars that form a recognizable pattern in the night sky.
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2. Constellations which are continuously visible above the North Pole are called _________ because they _________.
✔ Answer: Circumpolar; never set below the horizon
➡️ *Explanation:* These constellations appear to rotate around the North Celestial Pole and never dip below the horizon for observers in the northern hemisphere.
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3. The Earth rotates on its axis from _________ to _________.
✔ Answer: West; East
➡️ *Explanation:* The Earth rotates from west to east, which is why we see the Sun rise in the east and set in the west.
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4. The North Star is called _________. It is located almost exactly over the axis of the Earth.
✔ Answer: Polaris
➡️ *Explanation:* Polaris, also known as the North Star, is nearly aligned with Earth’s north rotational axis.
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5. The North Star is in the constellation _________.
✔ Answer: Ursa Minor
➡️ *Explanation:* Polaris is located at the end of the handle of the Little Dipper, which is part of the constellation Ursa Minor.
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6. An astronomical unit (AU) is about _________ km.
✔ Answer: 150 million (or 1.5 × 10⁸)
➡️ *Explanation:* One AU is the average distance between Earth and the Sun, approximately 149.6 million km.
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7. The next closest star, other than the sun, is _________.
✔ Answer: Proxima Centauri
➡️ *Explanation:* Proxima Centauri is the nearest star to our solar system, about 4.24 light-years away.
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8. A light year is about _________ km.
✔ Answer: 9.46 trillion (or 9.46 × 10¹²)
➡️ *Explanation:* A light-year is the distance light travels in one year (~300,000 km/sec × 365.25 days).
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9. The sun has a diameter of _________ km, and a density about _________ times that of water.
✔ Answer: 1.4 million; 1.4
➡️ *Explanation:* The Sun’s diameter is ~1.39 million km, and its average density is about 1.4 g/cm³, roughly 1.4 times that of water.
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10. Hydrogen is only one one-millionth as dense as the _________.
✔ Answer: Earth (or Earth's surface / solid matter)
➡️ *Explanation:* This likely refers to the fact that hydrogen gas is extremely low in density compared to solid or liquid materials like those found on Earth.
---
11. Cool stars are _________ in color than hotter stars. Hotter stars are _________.
✔ Answer: Redder; bluer
➡️ *Explanation:* Cooler stars emit more red light (lower temperature), while hotter stars emit blue/white light (higher temperature).
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12. A red hot star might have a surface temperature of only _________.
✔ Answer: 3,000 K (or around 3,000–4,000 K)
➡️ *Explanation:* Red stars like M-type main sequence stars have surface temperatures around 3,000–4,000 Kelvin.
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13. The temperature of our sun is _________.
✔ Answer: About 5,800 K (or 5,778 K)
➡️ *Explanation:* The Sun's surface (photosphere) temperature is approximately 5,800 K.
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14. Blue hot stars have a surface temperature of _________.
✔ Answer: Over 10,000 K (e.g., 20,000–50,000 K)
➡️ *Explanation:* O-type and B-type stars are very hot and blue, with surface temperatures exceeding 10,000 K.
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15. The brightest star in the sky is _________; it has a magnitude of _________.
✔ Answer: Sirius; -1.46
➡️ *Explanation:* Sirius, in the constellation Canis Major, is the brightest star in the night sky with an apparent magnitude of about -1.46.
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16. The brightness of a star as seen from earth is called _________. The true brightness of a star is called _________.
✔ Answer: Apparent magnitude; Absolute magnitude
➡️ *Explanation:* Apparent magnitude is how bright a star appears from Earth. Absolute magnitude is the brightness if the star were placed at a standard distance (10 parsecs).
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17. The difference between the brightness of a first magnitude star and a second magnitude star is about _________ times.
✔ Answer: 2.512
➡️ *Explanation:* Each magnitude step is a factor of ~2.512 in brightness (based on the logarithmic scale: 10^(0.4) ≈ 2.512). So, a 1st mag star is 2.512× brighter than a 2nd mag star.
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18. Absolute magnitude is the brightness of a star if it were placed _________ from the earth.
✔ Answer: 10 parsecs
➡️ *Explanation:* By definition, absolute magnitude is the apparent magnitude a star would have if it were 10 parsecs (about 32.6 light-years) away.
---
- Constellations & Navigation
- Earth's Rotation & Celestial Motion
- Astronomical Units & Light Years
- Star Temperature & Color
- Magnitude Scale (Apparent vs. Absolute)
Let me know if you'd like this formatted as a printable answer key or need help understanding any concept further!
Since I can't view images directly, I’ll need you to either:
1. Type out the questions from the worksheet so I can help solve them.
2. Or describe the content of the image in detail.
However, based on your description and the visible text in your message, I can already see the first 18 questions listed. Let me go through them one by one and provide correct answers with explanations.
---
✔ Earth Science 11 – Unit 1 Worksheet (Solutions & Explanations)
---
1. Constellations are groups of _________.
✔ Answer: Stars
➡️ *Explanation:* A constellation is a group of stars that form a recognizable pattern in the night sky.
---
2. Constellations which are continuously visible above the North Pole are called _________ because they _________.
✔ Answer: Circumpolar; never set below the horizon
➡️ *Explanation:* These constellations appear to rotate around the North Celestial Pole and never dip below the horizon for observers in the northern hemisphere.
---
3. The Earth rotates on its axis from _________ to _________.
✔ Answer: West; East
➡️ *Explanation:* The Earth rotates from west to east, which is why we see the Sun rise in the east and set in the west.
---
4. The North Star is called _________. It is located almost exactly over the axis of the Earth.
✔ Answer: Polaris
➡️ *Explanation:* Polaris, also known as the North Star, is nearly aligned with Earth’s north rotational axis.
---
5. The North Star is in the constellation _________.
✔ Answer: Ursa Minor
➡️ *Explanation:* Polaris is located at the end of the handle of the Little Dipper, which is part of the constellation Ursa Minor.
---
6. An astronomical unit (AU) is about _________ km.
✔ Answer: 150 million (or 1.5 × 10⁸)
➡️ *Explanation:* One AU is the average distance between Earth and the Sun, approximately 149.6 million km.
---
7. The next closest star, other than the sun, is _________.
✔ Answer: Proxima Centauri
➡️ *Explanation:* Proxima Centauri is the nearest star to our solar system, about 4.24 light-years away.
---
8. A light year is about _________ km.
✔ Answer: 9.46 trillion (or 9.46 × 10¹²)
➡️ *Explanation:* A light-year is the distance light travels in one year (~300,000 km/sec × 365.25 days).
---
9. The sun has a diameter of _________ km, and a density about _________ times that of water.
✔ Answer: 1.4 million; 1.4
➡️ *Explanation:* The Sun’s diameter is ~1.39 million km, and its average density is about 1.4 g/cm³, roughly 1.4 times that of water.
---
10. Hydrogen is only one one-millionth as dense as the _________.
✔ Answer: Earth (or Earth's surface / solid matter)
➡️ *Explanation:* This likely refers to the fact that hydrogen gas is extremely low in density compared to solid or liquid materials like those found on Earth.
---
11. Cool stars are _________ in color than hotter stars. Hotter stars are _________.
✔ Answer: Redder; bluer
➡️ *Explanation:* Cooler stars emit more red light (lower temperature), while hotter stars emit blue/white light (higher temperature).
---
12. A red hot star might have a surface temperature of only _________.
✔ Answer: 3,000 K (or around 3,000–4,000 K)
➡️ *Explanation:* Red stars like M-type main sequence stars have surface temperatures around 3,000–4,000 Kelvin.
---
13. The temperature of our sun is _________.
✔ Answer: About 5,800 K (or 5,778 K)
➡️ *Explanation:* The Sun's surface (photosphere) temperature is approximately 5,800 K.
---
14. Blue hot stars have a surface temperature of _________.
✔ Answer: Over 10,000 K (e.g., 20,000–50,000 K)
➡️ *Explanation:* O-type and B-type stars are very hot and blue, with surface temperatures exceeding 10,000 K.
---
15. The brightest star in the sky is _________; it has a magnitude of _________.
✔ Answer: Sirius; -1.46
➡️ *Explanation:* Sirius, in the constellation Canis Major, is the brightest star in the night sky with an apparent magnitude of about -1.46.
---
16. The brightness of a star as seen from earth is called _________. The true brightness of a star is called _________.
✔ Answer: Apparent magnitude; Absolute magnitude
➡️ *Explanation:* Apparent magnitude is how bright a star appears from Earth. Absolute magnitude is the brightness if the star were placed at a standard distance (10 parsecs).
---
17. The difference between the brightness of a first magnitude star and a second magnitude star is about _________ times.
✔ Answer: 2.512
➡️ *Explanation:* Each magnitude step is a factor of ~2.512 in brightness (based on the logarithmic scale: 10^(0.4) ≈ 2.512). So, a 1st mag star is 2.512× brighter than a 2nd mag star.
---
18. Absolute magnitude is the brightness of a star if it were placed _________ from the earth.
✔ Answer: 10 parsecs
➡️ *Explanation:* By definition, absolute magnitude is the apparent magnitude a star would have if it were 10 parsecs (about 32.6 light-years) away.
---
📝 Summary of Key Concepts Covered:
- Constellations & Navigation
- Earth's Rotation & Celestial Motion
- Astronomical Units & Light Years
- Star Temperature & Color
- Magnitude Scale (Apparent vs. Absolute)
Let me know if you'd like this formatted as a printable answer key or need help understanding any concept further!
Parent Tip: Review the logic above to help your child master the concept of earth science worksheet high school.
