Atronomy Ppts

• What is the shape of the Earth?

  Oblate spheroid
• Why is the Earth considered an oblate spheroid?

  Because it is slightly flattened at the poles due to its rapid rotation
• What is the assumed diameter of the Earth for this topic?

  13000 km
• How does the equatorial diameter compare to the pole-to-pole diameter?

  The equatorial diameter is 43 km larger than the pole-to-pole diameter
• What is the position of Earth in relation to the Sun?

  Earth is the third planet from the Sun
• What makes Earth unique among astronomical objects?


  It is the only astronomical object known to harbor life
• What percentage of Earth's surface is covered by oceans?

  71%
• What does the remaining 29% of Earth's surface consist of?

  Land, consisting of continents and islands
• What is the composition of Earth's surface layer?

  It is formed of several slowly moving tectonic plates
• What geological features are produced by the interaction of tectonic plates?

  Mountain ranges, volcanoes, and earthquakes
• How do you calculate the mean density of the Earth if its mass is approximately $6 \times 10^{24} \text{ kg}$ and it is assumed to be a perfect sphere of diameter $13000 \text{ km}$?


  Density $\rho =$$\frac{M}{V}$, where $V =$$\frac{4}{3} \pi R^3$
• What is the radius of the Earth in meters if the diameter is $13000 \text{ km}$?


  $R =$$\frac{13000 \text{ km}}{2} =$$6500 \text{ km} =$$6500000 \text{ m}$
• What is the calculated mean density of the Earth?

  $5200 \text{ kg/m}^3$
• What is the official figure for the bulk density of the Earth?

  $5500 \text{ kg/m}^3$
• What are the main layers of the Earth and their characteristics?

  • Inner core: Solid
  • Outer core: Liquid
  • Mantle: Behaves like a solid but flows
  • Crust: Very thin
• Why do we know about the internal structure of the Earth despite never having seen it?


  We use indirect evidence from seismic waves and other geological studies
• What is the shape of the Earth?

  Oblate spheroid
• Why is the Earth considered an oblate spheroid?

  Because it is slightly flattened at the poles due to its rapid rotation
• What is the assumed diameter of the Earth for this topic?

  13000 km
• How much larger is the equatorial diameter compared to the pole-to-pole diameter?

  43 km
• What is the position of Earth in relation to the Sun?

  Third planet from the Sun
• What makes Earth unique among astronomical objects?


  It is the only astronomical object known to harbor life
• What percentage of Earth's surface is covered by oceans?

  71%
• What does the remaining 29% of Earth's surface consist of?

  Land, including continents and islands
• What is the composition of Earth's surface layer?

  It is formed of several slowly moving tectonic plates
• What geological features are produced by the interaction of tectonic plates?

  Mountain ranges, volcanoes, and earthquakes
• How do you calculate the mean density of the Earth if its mass is approximately $6 \times 10^{24} \text{ kg}$ and it is assumed to be a perfect sphere of diameter $13000 \text{ km}$?


  Density $\rho =$$\frac{M}{V}$, where $V =$$\frac{4}{3} \pi R^3$
• What is the radius of the Earth in meters if the diameter is $13000 \text{ km}$?


  $R =$$6500 \text{ km} =$$6500000 \text{ m}$
• What is the calculated mean density of the Earth?

  $5200 \text{ kg/m}^3$
• What is the official figure for the bulk density of the Earth?

  $5500 \text{ kg/m}^3$
• What are the main layers of the Earth and their characteristics?

  • Inner core: Solid
  • Outer core: Liquid
  • Mantle: Behaves like a solid but flows
  • Crust: Very thin
• Why do we know about the internal structure of the Earth despite never having seen it?

  Through scientific methods and indirect evidence
• What is the radius of the inner core of the Earth?

  3500 km