5 Written Questions
5 Matching Questions
- Why the inner planets are rocky and the outer planets are gassy
- size of planets
- a mercury: 4,879 km in diameter
earth: 12,756 km
mars: 6,794 km
jupiter: 143,000 km
saturn: 120,500 km
uranus: 51,100 km
neptune: 49,500 km
pluto: 2,400 km
- b The middle of the sun's atmosphere
- c the planets were all formed from a rotating mass of gas and dust, all at the same time. Closer to the sun, denser elements were formed and held in its gravity, and hence formed the more dense planets, whereas the more gaseous, lighter elements were held further out in the sun's gravitational field.
- d A loose collection of ice, dust and small rocky particles, typically with a long, narrow orbit.
tail is always facing away from the sun
- e Rocky objects revolving around the sun that are too small and numerous to be considered planets
5 Multiple Choice Questions
- outer planets are gassier and inner planets are smaller and more dense, rocky surfaces
- photosphere, the chromosphere and the corona are all part of the suns atmosphere
- the outer layer of the sun's atmosphere.
- liquid water, the right temperature, energy (such as sunlight), suitable size, atmosphere, and carbon
5 True/False Questions
ring → A thin disk of small ice and rock particles surrounding a planet
meteor → A meteoroid that passes through the atmosphere and hits Earth's surface
on the ground
period of rotation → revolution, often referred to as orbital revolution for clarity, is used when one body moves around another while rotation is used to mean the movement around an axis.
surface water on mars → scientists think that a large amount of liquid water flowed on Mar's surface in the distant past
auroras → a natural electrical phenomenon characterized bu the appearance of streamer of reddish or greenish light in the sky, usually neat the northern or southern magnetic pole