The Earth as a planet Lesson 5 of the space course of Mova's primary school: 15 sentences, each with its syntax tree and pragmatics. The lessons are written for Mova, and their agreed trees are part of Mova corpus 0.4 (CC BY-SA 4.0). How Mova does on its tests: the lesson at school .
0 Our Earth is the third planet from the Sun, a rocky ball like Mercury, Venus and Mars, but the biggest of the four and the only one we know with life. 1 It spins once a day, which gives us day and night, and it races round the Sun once a year at about 30 kilometres every second, though we never feel it, just as you do not feel a smooth train. 2 The Earth leans over by about 23.4 degrees, and this tilt, not our distance from the Sun, makes summer and winter: in summer your half leans towards the Sun. 3 Inside, it is like a peach: a thin crust of rock, a thick hot mantle, and an iron core whose swirling liquid part makes a magnetic shield against the solar wind. 4 Seen from Voyager 1 six billion kilometres away, the whole Earth was a pale blue dot smaller than a single pixel. 5 The Earth is the third planet from the Sun and the largest of the four rocky planets. 6 The Earth is the only place in the universe where we know life exists, and the only planet known to have liquid water oceans on its surface. 7 The Earth's axis is tilted by about 23.4 degrees, and this tilt, not our distance from the Sun, causes the seasons. 8 The Earth spins once in about 24 hours, giving day and night, and goes round the Sun in about 365.25 days. 9 The extra quarter of a day each year is why we add a leap day, 29 February, about every four years. 10 The Earth has a thin rocky crust, a thick hot mantle, a liquid iron outer core and a solid iron inner core. 12 The Earth's air is about 78 percent nitrogen and 21 percent oxygen, and the oxygen was made by living things such as tiny ocean microbes and plants. 13 The Earth is the only planet known to have plate tectonics: the crust is broken into plates that slowly move. 14 The Earth bulges slightly at the equator, being about 43 kilometres wider across the equator than from pole to pole. 15 The Earth races round the Sun at about 30 kilometres per second, about 107,000 kilometres per hour. ← previous Venusnext → The Moon↑ back to Space This page in Markdown → https://md.mova.elamur.ai/free/en/corpora/school/space/5-the-earth-as-a-planet/