Question:

Intrusive or Extrusive rocks?

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Are these rocks intrusive or extrusive:

Basalt

Obsidian

Pumice

Granite

Help please.

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  1. Basalt === Extrusive

    Obsidian ==Extrusive

    Pumice ===Extrusive

    Granite==== Intrusive


  2. Basalt === Extrusive

    Obsidian ==Extrusive

    Pumice  ===Extrusive

    Granite==== Intrusive

  3. basalt-exrusive

    obsidian-extrusive

    pumice-extrusive

    granite-Intrusive

    Extrusive means its on the surface (on the ground). Intrusive means its below the earth's surface(in the ground) The first 3 are also volcanic rocks, a couple forming in the event of an eruption (obsidian and pumice). Basalt comes from cooled basaltic lava.

    Hope that helps
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