What are the key features of an explanation text?
Explanation texts usually include these features:Written in the present tense, in formal language.Text arranged into numbered points.Sub-headings to separate sections of text.Time connectives, such as: first, then, next, later, finally.
What does an explanation text look like?
Explanation text is a piece of non-fiction writing explaining an action process or event in a detailed but simple way. It features numbered points, time connectives, pictures, diagrams, labels and captions to help the receiver understand the process of what’s being delivered.
How do volcanoes erupt explanation text?
Volcanoes erupt when molten rock called magma rises to the surface. Magma is formed when the earth’s mantle melts. Runny magma erupts through openings or vents in the earth’s crust before flowing onto its surface as lava. If magma is thick, gas bubbles cannot easily escape and pressure builds up as the magma rises.
What are the stages of a volcanic eruption?
Volcano eruptions go through several stages typically beginning with earthquake swarms and gas emissions, then moving to initial steam and ash venting, lava dome buildup, dome collapse, magmatic explosions, more dome growth interspersed with dome failures and finally, ash, lava and pyroclastic eruptions.
How do volcanoes form and erupt?
Volcanoes are formed when magma from within the Earth’s upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
Where do volcanoes erupt?
Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes, like those that form the Hawaiian Islands, occur in the interior of plates at areas called “hot spots.”
Can a volcano erupt underwater?
Volcanoes are common occurrences along the boundaries of Earth’s tectonic plates. Since many plate boundaries are submerged, around three-quarters of all volcanic activity on Earth actually occurs underwater.
How many volcanoes are underwater?
The total number of submarine volcanoes is estimated to be over 1 million (most are now extinct), of which some 75,000 rise more than 1 km above the seabed. Hydrothermal vents, sites of abundant biological activity, are commonly found near submarine volcanoes.