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2. Revolution helmets - Wikipedia

   en.wikipedia.org/wiki/Revolution_helmets

   Revolution helmets are a line of football helmets produced by Riddell Sports Group. The helmet brand is the most popular model in use in the National Football League, used by 83% of the players in the league as of 2008. [1] The most recent model in the Revolution line is the Speedflex helmet.

3. Riddell Sports Group - Wikipedia

   en.wikipedia.org/wiki/Riddell_Sports_Group

   In 2002, Riddell released a new helmet design called the Revolution or "Revo" for short [9] The newer design was released in response to a study on concussions. The design became popular in the NFL and NCAA , being used by notables such as Peyton Manning , Dwight Freeney , Casey Hampton , and Brady Quinn , as well as having been used by Eli ...

4. Football helmet - Wikipedia

   en.wikipedia.org/wiki/Football_helmet

   In addition, Riddell has recently come out with a new design of helmets, the Riddell Speed Flex. This helmet came out in 2014. [7] This new helmet uses elements of Riddell's older helmets, the 360 and the Revolution, such as Side Impact Protection and All Points Quick Release face mask attachment system. [8]

5. Mudrock - Wikipedia

   en.wikipedia.org/wiki/Mudrock

   Mudrocks are a class of fine-grained siliciclastic sedimentary rocks. The varying types of mudrocks include siltstone, claystone, mudstone and shale. Most of the particles of which the stone is composed are less than 1 ⁄ 16 mm (0.0625 mm; 0.00246 in) and are too small to study readily in the field. At first sight, the rock types appear quite ...

6. Concretion - Wikipedia

   en.wikipedia.org/wiki/Concretion

   Other "pop rocks" are small polycuboid pyrite concretions, which are as much as 7 cm (0.23 ft) in diameter. These concretions are called "pop rocks" because they explode if thrown in a fire. Also, when they are either cut or hammered, they produce sparks and a burning sulfur smell.

7. Clastic rock - Wikipedia

   en.wikipedia.org/wiki/Clastic_rock

   Hydrothermal clastic rocks are generally restricted to those formed by hydrofracture, the process by which hydrothermal circulation cracks and brecciates the wall rocks and fills them in with veins. This is particularly prominent in epithermal ore deposits and is associated with alteration zones around many intrusive rocks, especially granites .