--- title: The sea floor has stripes of rock magnetised in alternate directions… — Plate tectonics · tree and pragmatics description: The sea floor has stripes of rock magnetised in alternate directions, matching on both sides of ocean ridges, because the magnetic field flips now and then while new crust forms at the ridge. Who acts: sea floor, magnetic field, new crust. A sentence of the lesson «Plate tectonics» of the geography --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/school/geography/42-plate-tectonics/14/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [school](https://md.mova.elamur.ai/free/en/corpora/school/) / [Geography](https://md.mova.elamur.ai/free/en/corpora/school/geography/) / [Plate tectonics](https://md.mova.elamur.ai/free/en/corpora/school/geography/42-plate-tectonics/) / 14 # Plate tectonics, sentence 14 The sea floor has stripes of rock magnetised in alternate directions, matching on both sides of ocean ridges, because the magnetic field flips now and then while new crust forms at the ridge. **Who acts:** sea floor, magnetic field, new crust · **What happens:** have, magnetise, matching, flip, form · **To what, where:** stripes, alternate directions, sides, ridge This is a sentence of the lesson «Plate tectonics» of the geography course of Mova's primary school. The page gives its syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause: who acts (sea floor, magnetic field, new crust), what happens, when and where, as Mova's frames read it from the tree. ## The tree {#tree} ```conllu # sent_id = school:geography:042-plate-tectonics.lesson:14 # text = The sea floor has stripes of rock magnetised in alternate directions, matching on both sides of ocean ridges, because the magnetic field flips now and then while new crust forms at the ridge. # source = school lesson (ours) # course = geography # lesson = 042-plate-tectonics.lesson # annotation = Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1 1 The the DET DT Definite=Def|PronType=Art 3 det _ _ 2 sea sea NOUN NN Number=Sing 3 compound _ _ 3 floor floor NOUN NN Number=Sing 4 nsubj _ _ 4 has have VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 0 root _ _ 5 stripes stripe NOUN NNS Number=Plur 4 obj _ _ 6 of of ADP IN _ 7 case _ _ 7 rock rock NOUN NN Number=Sing 5 nmod _ _ 8 magnetised magnetise VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 5 acl _ _ 9 in in ADP IN _ 11 case _ _ 10 alternate alternate ADJ JJ Degree=Pos 11 amod _ _ 11 directions direction NOUN NNS Number=Plur 8 obl _ _ 12 , , PUNCT , _ 13 punct _ _ 13 matching matching VERB VBG Tense=Pres|VerbForm=Part 8 conj _ _ 14 on on ADP IN _ 16 case _ _ 15 both both DET DT PronType=Tot 16 det _ _ 16 sides side NOUN NNS Number=Plur 13 obl _ _ 17 of of ADP IN _ 19 case _ _ 18 ocean ocean NOUN NN Number=Sing 19 compound _ Agree=R7-rel-agree|Haiku=19:amod|HaikuPos=ADJ:JJ:Degree=Pos 19 ridges ridge NOUN NNS Number=Plur 16 nmod _ _ 20 , , PUNCT , _ 25 punct _ _ 21 because because SCONJ IN _ 25 mark _ _ 22 the the DET DT Definite=Def|PronType=Art 24 det _ _ 23 magnetic magnetic ADJ JJ Degree=Pos 24 amod _ _ 24 field field NOUN NN Number=Sing 25 nsubj _ _ 25 flips flip VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 4 advcl _ _ 26 now now ADV RB PronType=Dem 25 advmod _ _ 27 and and CCONJ CC _ 28 cc _ _ 28 then then ADV RB PronType=Dem 26 conj _ _ 29 while while SCONJ IN _ 32 mark _ _ 30 new new ADJ JJ Degree=Pos 31 amod _ _ 31 crust crust NOUN NN Number=Sing 32 nsubj _ _ 32 forms form VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 25 advcl _ _ 33 at at ADP IN _ 35 case _ _ 34 the the DET DT Definite=Def|PronType=Art 35 det _ _ 35 ridge ridge NOUN NN Number=Sing 32 obl _ _ 36 . . PUNCT . _ 4 punct _ _ ``` ## Pragmatics {#pragmatics} No stored speech act for this sentence. | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **have** | present | the sea floor | stripes of rock | | | | | vn birth-28.2-1 «NP V NP»: agent=Agent stripe=Patient | | 2 | **magnetise** | participle | | stripes of rock *not said here* | | alternate directions | | | tree rules | | 3 | **matching** | gerund | | | | both sides of ocean ridges | | | tree rules | | 4 | **flip** | present | the magnetic field | | | | now | | vn throw-17.1-1 «NP V NP»: agent=Agent | | 5 | **form** | present | new crust | | | the ridge | | | vn appear-48.1.1 «NP V PP.location»: agent=Theme at ridge=Location | One row per clause the reader finds. «not said here»: a role filled from the clause above. «roles by»: a VerbNet class and frame when one fits the verb, else the reader's rules on the tree. **Licence: [CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)**, as the whole of Mova corpus 0.4, of which this treebank (the agreed school, `mova-school-agreed-en.conllu`) is part. The lessons were written for Mova's primary school. Sentence `school:geography:042-plate-tectonics.lesson:14`. **The tree:** Mova annot: Rust (en) → Haiku 5.5 (medium, Batches API) patches; gates UD 2.18; agreed by treeagree rules (Stanza, Trankit, spaCy trf): R7-rel-agree ×1. **The frames** are read from the tree by Mova's frames reader (`prag`) when this page is built, the lesson read in order, so a pronoun may be resolved from an earlier sentence. See the [release 0.4](https://md.mova.elamur.ai/free/en/releases/0.4/). - ← previous: [Plate tectonics, 13](https://md.mova.elamur.ai/free/en/corpora/school/geography/42-plate-tectonics/13/) - next →: [Plate tectonics, 15](https://md.mova.elamur.ai/free/en/corpora/school/geography/42-plate-tectonics/15/) - ↑ back to [the lesson](https://md.mova.elamur.ai/free/en/corpora/school/geography/42-plate-tectonics/)