--- title: Identify the principal reason for which ice floats upon liquid water. — Water: the most amazing liquid · tree and pragmatics description: Identify the principal reason for which ice floats upon liquid water. Exam question 1 of lesson 34 «Water: the most amazing liquid» of the chemistry course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's choice was right. --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/questions/chemistry/34-water-amazing-liquid/e1/) [home](https://md.mova.elamur.ai/free/en/) / [corpora](https://md.mova.elamur.ai/free/en/corpora/) / [questions](https://md.mova.elamur.ai/free/en/corpora/questions/) / [Chemistry](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/) / [Water: the most amazing liquid](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/34-water-amazing-liquid/) / e1 # Exam question 1 · Water: the most amazing liquid Identify the principal reason for which ice floats upon liquid water. **Mova's choice:** option 3 · **The right answer:** option 3 · right ✓ · **Who acts:** you, ice · **What happens:** identify, float · **To what, where:** principal reason, liquid water This is exam question 1 of lesson 34 «Water: the most amazing liquid» of the chemistry course of Mova's primary school, asked in stiff, formal language. The page gives the question's syntax tree — a dependency tree in the style of Universal Dependencies — and its pragmatics clause by clause, then the 4 options as the student saw them, each with its tree and pragmatics. Every text is parsed by Mova itself. How the student answered it, with the score of every option and why: [the test at school](https://md.mova.elamur.ai/free/en/school-run/chemistry/34-water-amazing-liquid/#e1). ## The question {#question} ```conllu # sent_id = question:chemistry:34-water-amazing-liquid:e1:1 # text = Identify the principal reason for which ice floats upon liquid water. 1 Identify identify VERB VB Mood=Imp|VerbForm=Fin 0 root _ _ 2 the the DET DT Definite=Def|PronType=Art 4 det _ _ 3 principal principal ADJ JJ Degree=Pos 4 amod _ _ 4 reason reason NOUN NN Number=Sing 1 obj _ _ 5 for for ADP IN _ 6 case _ _ 6 which which PRON WDT PronType=Rel 8 obl _ _ 7 ice ice NOUN NN Number=Sing 8 nsubj _ _ 8 floats float VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 4 acl _ _ 9 upon upon ADP IN _ 11 case _ _ 10 liquid liquid ADJ JJ Degree=Pos 11 amod _ _ 11 water water NOUN NN Number=Sing 8 obl _ SpaceAfter=No 12 . . PUNCT . _ 1 punct _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **identify** | imperative | you *not said here* | the principal reason | | | | | vn characterize-29.2-1-1 «NP V NP S\_ING»: agent=Agent reason=Theme | | 2 | **float** | present | ice | | | liquid water | | for the principal reason | vn run-51.3.2-2 «NP V PP.location»: agent=Theme upon water=Trajectory | 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. ## The options {#options} ### Option 1 {#o1} Liquid water exerts a magnetic force on ice ```conllu # sent_id = question:chemistry:34-water-amazing-liquid:e1:o1:1 # text = Liquid water exerts a magnetic force on ice 1 Liquid liquid ADJ JJ Degree=Pos 2 amod _ _ 2 water water NOUN NN Number=Sing 3 nsubj _ _ 3 exerts exert VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 0 root _ _ 4 a a DET DT Definite=Ind|PronType=Art 6 det _ _ 5 magnetic magnetic ADJ JJ Degree=Pos 6 amod _ _ 6 force force NOUN NN Number=Sing 3 obj _ _ 7 on on ADP IN _ 8 case _ _ 8 ice ice NOUN NN Number=Sing 6 nmod _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **exert** | present | Liquid water | a magnetic force | | ice | | | vn use-105.1 «NP V NP»: agent=Agent force=Theme | ### Option 2 {#o2} Ice is composed of a lighter variety of water ```conllu # sent_id = question:chemistry:34-water-amazing-liquid:e1:o2:1 # text = Ice is composed of a lighter variety of water 1 Ice ice NOUN NN Number=Sing 3 nsubj:pass _ _ 2 is be AUX VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 3 aux:pass _ _ 3 composed compose VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 0 root _ _ 4 of of ADP IN _ 7 case _ _ 5 a a DET DT Definite=Ind|PronType=Art 7 det _ _ 6 lighter light ADJ JJR Degree=Cmp 7 amod _ _ 7 variety variety NOUN NN Number=Sing 3 obl _ _ 8 of of ADP IN _ 9 case _ _ 9 water water NOUN NN Number=Sing 7 nmod _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **compose** | present · passive | | Ice | | | | of a lighter variety of water | vn create-26.4-1 «NP V NP»: subject=Result | ### Option 3 · ← Mova's choice · ✓ the right answer {#o3} Water expands upon freezing and becomes less dense ```conllu # sent_id = question:chemistry:34-water-amazing-liquid:e1:o3:1 # text = Water expands upon freezing and becomes less dense 1 Water water NOUN NN Number=Sing 2 nsubj _ _ 2 expands expand VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 0 root _ _ 3 upon upon ADP IN _ 4 case _ _ 4 freezing freezing NOUN NN Number=Sing 2 obl _ _ 5 and and CCONJ CC _ 6 cc _ _ 6 becomes become VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 2 conj _ _ 7 less less ADV RBR Degree=Cmp 8 advmod _ _ 8 dense dense ADJ JJ Degree=Pos 6 xcomp _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **expand** | present | Water | | | | | upon freezing | vn other\_cos-45.4 «NP.patient V»: agent=Patient | | 2 | **become** | present | Water *not said here* | | | | | dense *property* | vn become-109.1-1-1 «NP V PP.attribute»: agent=Patient | ### Option 4 {#o4} Ice contains a large proportion of trapped air ```conllu # sent_id = question:chemistry:34-water-amazing-liquid:e1:o4:1 # text = Ice contains a large proportion of trapped air 1 Ice ice NOUN NN Number=Sing 2 nsubj _ _ 2 contains contain VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 0 root _ _ 3 a a DET DT Definite=Ind|PronType=Art 5 det _ _ 4 large large ADJ JJ Degree=Pos 5 amod _ _ 5 proportion proportion NOUN NN Number=Sing 2 obj _ _ 6 of of ADP IN _ 8 case _ _ 7 trapped trap VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 8 amod _ _ 8 air air NOUN NN Number=Sing 5 nmod _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **contain** | present | Ice | a large proportion of trapped air | | | | | vn comprise-107.2-2 «NP V NP»: agent=Pivot proportion=Theme | | 2 | **trap** | participle | | | | | | | vn trick-59.2 «NP V NP»: agent=Agent | **Text:** the tests of Mova's primary school, written for Mova (`world/data/school/`), as the course runner gave them to the student. **Trees:** Mova's own parse — the `en` model on the CPU, when the site is built — not checked by a teacher; they may be wrong. **Frames:** Mova's frames reader (`prag`), each text read on its own. Elamur Cosmic License. - ← previous: [Water: the most amazing liquid, test 11](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/34-water-amazing-liquid/t11/) - next →: [Water: the most amazing liquid, exam 2](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/34-water-amazing-liquid/e2/) - ↑ back to [Water: the most amazing liquid](https://md.mova.elamur.ai/free/en/corpora/questions/chemistry/34-water-amazing-liquid/)