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2. Seventh grade - Wikipedia

   en.wikipedia.org/wiki/Seventh_grade

   Seventh grade. Seventh grade (also 7th Grade or Grade 7) is the seventh year of formal or compulsory education. The seventh grade is typically the first, second or third year of middle school. In the United States, children in seventh grade are usually around 12–13 years old. Different terms and numbers are used in other parts of the world.

3. Naturales quaestiones - Wikipedia

   en.wikipedia.org/wiki/Naturales_quaestiones

   Naturales quaestiones (Natural Questions) is a Latin work of natural philosophy written by Seneca around 65 AD. It is not a systematic encyclopedia like the Naturalis Historia of Pliny the Elder , though with Pliny's work it represents one of the few Roman works dedicated to investigating the natural world.

4. Mathematics - Wikipedia

   en.wikipedia.org/wiki/Mathematics

   The word mathematics comes from Ancient Greek máthēma (μάθημα), meaning "that which is learnt", [7] "what one gets to know", hence also "study" and "science". The word came to have the narrower and more technical meaning of "mathematical study" even in Classical times.

5. Diatomaceous earth - Wikipedia

   en.wikipedia.org/wiki/Diatomaceous_earth

   Diatomite rock sample from Sisquoc Formation Scanning electron micrograph of diatomaceous earth. Diatomaceous earth (/ ˌ d aɪ. ə t ə ˈ m eɪ ʃ ə s / DY-ə-tə-MAY-shəs), diatomite (/ d aɪ ˈ æ t ə m aɪ t / dy-AT-ə-myte), celite or kieselgur/kieselguhr is a naturally occurring, soft, siliceous sedimentary rock that can be crumbled into a fine white to off-white powder.

6. Natural science - Wikipedia

   en.wikipedia.org/wiki/Natural_science

   v. t. e. Natural science is one of the branches of science concerned with the description, understanding and prediction of natural phenomena, based on empirical evidence from observation and experimentation. [1] Mechanisms such as peer review and reproducibility of findings are used to try to ensure the validity of scientific advances.

7. Chemistry - Wikipedia

   en.wikipedia.org/wiki/Chemistry

   Chemistry is the scientific study of the properties and behavior of matter. [1] It is a physical science within the natural sciences that studies the chemical elements that make up matter and compounds made of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during reactions with other substances.

8. Index of branches of science - Wikipedia

   en.wikipedia.org/wiki/Index_of_branches_of_science

   Eccrinology – study of excretion. Ecology – study of environment. Economics – study of material wealth (production, distribution, and consumption of goods and services). Edaphology – study of soils. Egyptology – study of ancient Egypt. Eidology – study of mental imagery. [2] Ekistics – study of human settlement.

9. Patterns in nature - Wikipedia

   en.wikipedia.org/wiki/Patterns_in_nature

   Patterns in nature are visible regularities of form found in the natural world. These patterns recur in different contexts and can sometimes be modelled mathematically. Natural patterns include symmetries, trees, spirals, meanders, waves, foams, tessellations, cracks and stripes. [1] Early Greek philosophers studied pattern, with Plato ...