Description

a trait that increases the chances that an organism will survive and reproduc
was a naturalist who proposed and provided scientific evidence that all species of life have evolved over time from common ancestors through the process he called natural selection.
the change in population of a species over time.
The evolutionary termination of a species caused by the failure to reproduce and the death of all remaining members of the species; the natural failure to adapt to environmental change.
evidence of past life preserved in rock.
the complete body of fossils that shows how species and ecosystems change over time.
the process of becoming a fossil
a fossil found in a narrow time range but widely distributed around the earth; used to date rock layers
survival of the fittest organisms that are the best adapted to their environment and the ones that will live long enough to reproduce and pass on their favorable adaptations
the most specific classification of living things
an explanation that ties together many hypothesis and observations.
a fossilized mark that is formed in soft sediment by the movement or actions of an animal.
any method of measuring the age of an event or object in years. the actual age for a rock or mineral
theory that states that the gradual shifting of Earth’s plates causes continents to change their global positions over time
the matching up of rock layers from different locations
the boundary formed by the collision of two lithospheric plates
the boundary between two tectonic plates that are moving away from each other.
the time needed for half of a sample of radioactive substance to undergo radioactive decay.
states that the oldest rocks lie on the bottom and the youngest rocks are on top of any undisturbed sequence of sedimentary rocks.
the theory that explains how large pieces of the Earth’s outermost layer called tectonic plates move and change shape.
the process by which the age of a rock is determined by measuring the amount of radioactive isotopes present in the rock or rock sample
the method used for absolute dating.
the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element.
uses information about rock layers and the fossil record to determine the age relationships between rocks
gaps in the rock record.
the largest division of geologic time
a subdivision of a geologic period
a unit of geologic time that includes two or more periods
the standard method used to divide the Earth’s long natural history into manageable parts
era that began about 66 million years ago, known as the “Age of Mammals”
occurs when a large proportion of the earth’s species go extinct in a relatively short period of time.
era that began 245 million years ago, known as the age of the dinosaurs
a subdivision of the eras in geologic time

Customize
Add, edit, delete clues, and customize this puzzle.

chapter 19

Crossword

Chapter 19

Crossword

Earth's History

Crossword

rocks and minerals

Crossword

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.