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slate

Primary Information
Secondary Information

Definition

Slate is a fine-grained, metamorphic rock that is formed when mudstone is subjected to high pressure and heat. Slate is typically grey or black in colour, but it can also be green, red, or brown.

Slate is a very strong and durable rock. It is resistant to weathering and erosion, and it is also fire-resistant. Slate is also a good conductor of heat, which makes it useful for roofing and other applications where heat transfer is important.

Slate is used for a variety of purposes, including:

  • Roofing
  • Blackboards
  • Countertops
  • Flooring
  • Wall cladding
  • Ornamental stone
  • Sculpture

Slate is a versatile and durable rock that has been used for centuries for a variety of purposes. It is a valuable resource that is still in use today.

How can the word be used?

The children wrote on slates in school.

slate

Different forms of the word

Noun:

  • a fine-grained sedimentary rock that is easily split into thin sheets.
  • a roof or covering made of slate.
  • a piece of slate used for writing or drawing on.

Verb:

  • to cover with slate.
  • to write or draw on slate.

Etymology

The word "slate" comes from the Old English word "slæt", which also means "slate".

The first recorded use of the word "slate" in English was in the 8th century.

The word "slate" is an Old English word, and it is related to the Dutch word "leiste" and the German word "Schiefer".

Question

What is slate used for?

AQA Science Exam Question and Answer

Question:

Explain the formation and uses of slate as a metamorphic rock, emphasising its unique properties and practical applications in construction and roofing.

Answer:

Slate is a metamorphic rock formed from the alteration of sedimentary rock, typically shale, through heat and pressure. The process causes the minerals within the rock to recrystallise, resulting in slate's characteristic foliated structure.

Slate's unique properties make it a valuable resource in construction and roofing. Its cleavage planes allow it to be easily split into thin, flat sheets, making it a favoured material for roofing tiles and floor tiles. The fine-grained texture and durability of slate make it resistant to water absorption and weathering, ensuring its longevity in various applications.

In roofing, slate tiles provide an excellent barrier against moisture and offer thermal insulation, contributing to energy efficiency. The natural variations in colour and texture enhance the aesthetic appeal of buildings. Additionally, slate's use in construction extends to walls, walkways, and even billiard tables due to its smooth, even surface.

In conclusion, slate's formation from shale and its distinct characteristics have led to its widespread use in construction and roofing. Its ability to be easily shaped into tiles, resistance to environmental factors, and appealing appearance make it a versatile and sought-after material for architectural and decorative purposes.