Description

a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.
the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy.
An igneous rock, fault, or other geologic feature must be younger than any rock across which it cuts.
a surface of contact between two groups of unconformable strata.
the action of placing one thing on or above another, especially so that they coincide.
rock that are formed by the deposition and subsequent cementation of mineral or organic particles on the floor of oceans or other bodies of water at the Earth's surface.
the science of determining the relative order of past events (i.e., the age of an object in comparison to another), without necessarily determining their absolute age
the branch of science concerned with fossil animals and plants.
the theory that changes in the earth's crust during geological history have resulted chiefly from sudden violent and unusual events.
the theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes.
each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.
transform (a sediment or other material) into stone.
the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.
The spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles.
the time taken for the radioactivity of a specified isotope to fall to half its original value.

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Earth's History

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Earth's History

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rocks and minerals

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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.

How do I create a crossword template?

For the easiest crossword templates, WordMint is the way to go!

Pre-made templates

For a quick and easy pre-made template, simply search through WordMint’s existing 500,000+ templates. With so many to choose from, you’re bound to find the right one for you!

Create your own from scratch

  • Log in to your account (it’s free to join!)
  • Head to ‘My Puzzles’
  • Click ‘Create New Puzzle’ and select ‘Crossword’
  • Select your layout, enter your title and your chosen clues and answers
  • That’s it! The template builder will create your crossword template for you and you can save it to your account, export as a word document or pdf and print!

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.

Can I print my crossword template?

All of our templates can be exported into Microsoft Word to easily print, or you can save your work as a PDF to print for the entire class. Your puzzles get saved into your account for easy access and printing in the future, so you don’t need to worry about saving them at work or at home!

Can I create crosswords in other languages?

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.