| Term No. | Term Name | Term Description |
| 1622 | H horizon | Is an organic horizon formed or forming an accumulation of organic material deposited on the surface, that is saturated with water for prolonged perio..... |
| 6749 | Habitat | 1 - The natural environment in which a population of plants or animals occurs. 2 – See 9318...... |
| 9318 | Habitat | 1 - The particular environment or place where an organism or species tends to live; a more locally circumscribed portion of the total environment. 2 â..... |
| 1211 | Haigh sounder | A device, based on Boyle’s law, invented by F. F. Haigh for measuring depth...... |
| 840 | Hail | Small, roughly spherical lumps of approximately concentric shells of clear ice and compact snow, collectively, that are precipitated during thundersto..... |
| 2099 | Half bog soil | Swampy or marshy soil with an organic horizon overlying gray mineral soil...... |
| 5727 | Half wrought timber | Semi-finished timber, which requires further finishing, by hand or machine, before it can be put to use...... |
| 8173 | Half-Duplex | A communications mode that allows transmission and reception of digital data between computers, but not simultaneously...... |
| 7159 | Half‑life | The time required for the decay or disappearance of half of a substance that decays in a regular, exponential way...... |
| 7721 | Halocline | The boundary between two masses of water whose salinity differs...... |
| 1905 | Halophobe | A plant which will not grow in a soil containing any appreciable amount of salt...... |
| 7036 | Halophyte | A plant that tolerates very salty soil...... |
| 1903 | Halophytes | Plant which will live in a soil containing an appreciable amount of common salt or of other inorganic salts...... |
| 1904 | Halophytic vegetation | Salt-loving or salt-tolerant vegetation...... |
| 6022 | Hammer mill | A crusher consisting of a higher-speed rotating shaft with suspended hammers that repeatedly strike the rock and throw it against breaker plates, ther..... |
| 4412 | Hand-tripping | A means of giving an up-and-downward motion to tools in surging...... |
| 9253 | Handouts | Written materials that supplement, explain, or amplify a presentation. Each participant receives the same material that can be distributed before or a..... |
| 8174 | Handshaking | A communications synchronizing technique carried out before and after any transfer of digital data. It consists of a sequence of signals for non-clock..... |
| 2317 | Hansen weir | It is a rectangular and suppressed laboratory weir used by V.W. Hansen in 1892 for his experiments. The head over the weir is measured at a distance o..... |
| 7728 | Hard water | Water containing high amounts of dissolved mineral salts (mainly bicarbonates, chlorides and sulphates of calcium and magnesium) that interfere with s..... |
| 8368 | Hard-disk drive, Winchester Drive | A sealed unit containing high-density, high-speed, rigid metal disks, and recording heads to store digital data. It reads and writes data faster than ..... |
| 5534 | Hardening | The process that commences at the end of the initial set and indicates the growth in strength of the mortar or concrete. Under good curing conditions,..... |
| 5703 | Hardening | Any process that increases the hardness...... |
| 5702 | Hardness | Resistance to indentation, abrasion, deformation, scratch, etc...... |
| 1850 | Hardpan, or Ortstein | A formation which occurs by precipitation of dissolved materials, such as calcium carbonate or silica, at certain depths below the surface year after ..... |
