Description

type of rock which has been changed by extreme heat and pressure.
Rock that has formed through the deposition and solidification
magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic
a hard crystalline metamorphic form of limestone
a fine-grained, dark-coloured extrusive igneous rock composed mainly of plagiarise and pyroxene
a fine-grained, extrusive igneous rock that is usually light in colour
a coarse-grained, dark-coloured, intrusive igneous rock that contains feldspar, pyroxene, and sometimes olivine.
a coarse-grained, intrusive igneous rock that contains a mixture of feldspar, pyroxene, hornblende, and sometimes quartz.
a coarse-grained, light-colored, intrusive igneous rock that contains mainly quartz, feldspar, and mica minerals.
a coarse-grained intrusive igneous rock that is composed almost entirely of olivine.
a light-colored, extremely coarse-grained intrusive igneous rock. It forms near the margins of a magma chamber during the final phases of magma chamber crystallisation
a light-colored, fine-grained, extrusive igneous rock that typically contains quartz and feldspar minerals. The specimen shown above is about two inches (five centimeters) across. Tuff Welded Tuff is a rock that is composed of materials that were ejected from a volcano, fell to Earth, and then lithified into a rock. It is usually composed mainly of volcanic ash and sometimes contains larger size particles such as cinders. The specimen shown above is about two inches (five centimeters) across.
a variety of opal that has a bright yellow, bright orange or bright red background color. The stones in the first photo on this page are fire opal. They receive their name from their fiery background color.
is a rock that is composed of materials that were ejected from a volcano, fell to Earth, and then lithified into a rock. It is usually composed mainly of volcanic ash and sometimes contains larger size particles such as cinders. The specimen shown above is about two inches (five centimeters) across.
a dark-colored, vesicular, extrusive igneous rock. The vesicles are a result of trapped gas within the melt at the time of solidification. It often forms as a frothy crust on the top of a lava flow or as material ejected from a volcanic vent and solidifying while airborne. The specimen shown above is about two inches (five centimeters) across.
hard, tough chemical or biochemical sedimentary rock that breaks with a conchoidal fracture. It is a form of microcrystalline quartz that is typically called “chert” by geologists.
the name used for a coarse-grained granitic rock that, after metamorphism, contains abundant pink orthoclase and pistachio-green epidote. These colors have helped it become a popular lapidary material. It is easily cut and polished to produce beads, cabochons, small sculptures, and other ornamental items. It is also a popular material for producing tumbled stones in a rock tumbler. Unakite is attractive, abundant, inexpensive, and frequently seen in the craft jewelry marketplace.
Earth's most important iron ore deposits are found in sedimentary rocks. They formed from chemical reactions that combined iron and oxygen in marine and fresh waters. The two most important minerals in these deposits are iron oxides: hematite (Fe2O3) and magnetite (Fe3O4). These iron ores have been mined to produce almost every iron and steel object that we use today - from paper clips to automobiles to the steel beams in skyscrapers.

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Frequently Asked Questions

What is a crossword?

Crossword puzzles have been published in newspapers and other publications since 1873. They consist of a grid of squares where the player aims to write words both horizontally and vertically.

Next to the crossword will be a series of questions or clues, which relate to the various rows or lines of boxes in the crossword. The player reads the question or clue, and tries to find a word that answers the question in the same amount of letters as there are boxes in the related crossword row or line.

Some of the words will share letters, so will need to match up with each other. The words can vary in length and complexity, as can the clues.

Who is a crossword suitable for?

The fantastic thing about crosswords is, they are completely flexible for whatever age or reading level you need. You can use many words to create a complex crossword for adults, or just a couple of words for younger children.

Crosswords can use any word you like, big or small, so there are literally countless combinations that you can create for templates. It is easy to customise the template to the age or learning level of your students.

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How do I choose the clues for my crossword?

Once you’ve picked a theme, choose clues that match your students current difficulty level. For younger children, this may be as simple as a question of “What color is the sky?” with an answer of “blue”.

Are crosswords good for students?

Crosswords are a great exercise for students' problem solving and cognitive abilities. Not only do they need to solve a clue and think of the correct answer, but they also have to consider all of the other words in the crossword to make sure the words fit together.

Crosswords are great for building and using vocabulary.

If this is your first time using a crossword with your students, you could create a crossword FAQ template for them to give them the basic instructions.

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Crosswords are a fantastic resource for students learning a foreign language as they test their reading, comprehension and writing all at the same time. When learning a new language, this type of test using multiple different skills is great to solidify students' learning.

We have full support for crossword templates in languages such as Spanish, French and Japanese with diacritics including over 100,000 images, so you can create an entire crossword in your target language including all of the titles, and clues.