B2 中高級 美國腔 817 分類 收藏
開始影片後,點擊或框選字幕可以立即查詢單字
字庫載入中…
回報字幕錯誤
You're watching FreeSchool!
Rocks are everywhere! They are large and small, heavy or light, porous or dense, but rocks
in some shape or form can be found all over the planet. Different types of rock are formed
in different ways. There are three main types of rock: Igneous, Sedimentary, and Metamorphic.
Igneous is a word that means 'fiery.' Igneous rock is formed when magma or lava cools. Sometimes
magma cools slowly underneath the earth's surface. This forms intrusive igneous rock,
like granite. Other times lava cools when it comes to the surface in a volcanic eruption.
This forms extrusive igneous rock. Some examples of extrusive igneous rock are tuff, obsidian,
and pumice. Igneous rocks make up about 95% of the earth's crust.
The next type of rock is Sedimentary rock. Sediment is small particles of sand, mud,
and organic material that settle to the bottom of water or land areas, often lakes or oceans.
Sedimentary rocks are formed when sediment accumulates over time in deposits that form
layers. These layers become squeezed and compressed over time until they consolidate into a rock.
Sedimentary rocks are the types of rocks in which fossils may be found, since the process
of forming sedimentary rocks can preserve plant and animal remains that are deposited
into the sediment layers. Some examples of sedimentary rock are limestone, shale, and
sandstone.
The third type of rock is Metamorphic rock. The word 'metamorph' means to change form,
and metamorphic rock is rock that has been changed by extreme heat and pressure. Sedimentary
rock, igneous rock, or even other metamorphic rocks can be changed by heat and pressure
into new kinds of rock. Metamorphic rocks can be formed by being deep under the earth,
where pressure and temperatures are high, or when rock near the surface is heated up
by the movement of tectonic plates or magma. Different types of rocks become different
types of metamorphic rock when exposed to heat and pressure. For example, shale becomes
slate, sandstone becomes quartzite, and limestone becomes marble.
Rocks are slowly but constantly changing in something known as the 'rock cycle.' The rock
cycle begins with magma, or hot melted rock, deep beneath the earth's surface. This magma
becomes crystallized, becoming igneous rock. These rocks begin to erode, or break down
into small pieces because of wind, water, or other forces. The small fragments of rock
are carried away as sediment when water passes over them and are deposited in layers which
eventually become sedimentary rocks. Then, some sedimentary rocks are pushed below the
surface due to tectonic activity, where they are exposed to heat and pressure, transforming
them into metamorphic rocks. If the rocks are buried even deeper, they may melt and
form magma, starting the cycle all over again. Of course, sedimentary and metamorphic rocks
can be eroded into sediment, and igneous rock can become metamorphic rock or lava, but one
way or another, rocks all over the world keep changing from one form to the next.
提示:點選文章或是影片下面的字幕單字,可以直接快速翻譯喔!

載入中…

基本地質學: 三種類型的岩石及岩層循環 (3 Types of Rocks and the Rock Cycle: Igneous, Sedimentary, Metamorphic - FreeSchool)

817 分類 收藏
Jenny 發佈於 2017 年 12 月 24 日    Jenny 翻譯    Rachel Kung 審核
看更多推薦影片
  1. 1. 單字查詢

    在字幕上選取單字即可即時查詢單字喔!

  2. 2. 單句重複播放

    可重複聽取一句單句,加強聽力!

  3. 3. 使用快速鍵

    使用影片快速鍵,讓學習更有效率!

  4. 4. 關閉語言字幕

    進階版練習可關閉字幕純聽英文哦!

  5. 5. 內嵌播放器

    可以將英文字幕學習播放器內嵌到部落格等地方喔

  6. 6. 展開播放器

    可隱藏右方全文及字典欄位,觀看影片更舒適!

  1. 英文聽力測驗

    挑戰字幕英文聽力測驗!

  1. 點擊展開筆記本讓你看的更舒服

  1. UrbanDictionary 俚語字典整合查詢。一般字典查詢不到你滿意的解譯,不妨使用「俚語字典」,或許會讓你有滿意的答案喔