--- title: A rock has half its radioactive atoms left after one half-life. Afte… — Deep time and the story of life · tree and pragmatics description: A rock has half its radioactive atoms left after one half-life. After a second half-life, how much is left? Test 3 · ★★★ of lesson 58 «Deep time and the story of life» of the geography course of Mova's primary school, with the dependency tree and pragmatics of the question and of each option; Mova's --- [Mova](https://md.mova.elamur.ai/free/en/) · [this page in HTML](https://mova.elamur.ai/free/en/corpora/questions/geography/58-deep-time-and-the-story-of-life/t3/) [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/) / [Geography](https://md.mova.elamur.ai/free/en/corpora/questions/geography/) / [Deep time and the story of life](https://md.mova.elamur.ai/free/en/corpora/questions/geography/58-deep-time-and-the-story-of-life/) / t3 # Test 3 · ★★★ · Deep time and the story of life A rock has half its radioactive atoms left after one half-life. After a second half-life, how much is left? **Mova's choice:** option 1 · **The right answer:** option 1 · right ✓ · **Who acts:** rock · **What happens:** have, leave · **To what, where:** radioactive atoms, second half life This is test 3 · ★★★ of lesson 58 «Deep time and the story of life» of the geography course of Mova's primary school. 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/geography/58-deep-time-and-the-story-of-life/#t3). ## The question {#question} *Sentence 1:* A rock has half its radioactive atoms left after one half-life. ```conllu # sent_id = question:geography:58-deep-time-and-the-story-of-life:t3:1 # text = A rock has half its radioactive atoms left after one half-life. 1 A a DET DT Definite=Ind|PronType=Art 2 det _ _ 2 rock rock NOUN NN Number=Sing 3 nsubj _ _ 3 has have VERB VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 0 root _ _ 4 half half DET PDT NumForm=Word|NumType=Frac|PronType=Ind 7 det:predet _ _ 5 its its PRON PRP$ Case=Gen|Gender=Neut|Number=Sing|Person=3|Poss=Yes|PronType=Prs 7 nmod:poss _ _ 6 radioactive radioactive ADJ JJ Degree=Pos 7 amod _ _ 7 atoms atom NOUN NNS Number=Plur 3 obj _ _ 8 left leave VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 7 acl _ _ 9 after after ADP IN _ 13 case _ _ 10 one one NUM CD NumForm=Word|NumType=Card 13 nummod _ _ 11 half half NOUN NN Number=Sing|NumForm=Word|NumType=Frac 13 compound _ SpaceAfter=No 12 - - PUNCT HYPH _ 11 punct _ SpaceAfter=No 13 life life NOUN NN Number=Sing 8 obl _ SpaceAfter=No 14 . . PUNCT . _ 3 punct _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **have** | present | a rock | rock's radioactive atoms | | | | | vn birth-28.2-1 «NP V NP»: agent=Agent atom=Patient | | 2 | **leave** | participle | | rock's radioactive atoms *not said here* | | | after one half life | | vn escape-51.1-1-1 «NP V»: agent=Theme | 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. *Sentence 2:* After a second half-life, how much is left? ```conllu # sent_id = question:geography:58-deep-time-and-the-story-of-life:t3:2 # text = After a second half-life, how much is left? 1 After after ADP IN _ 6 case _ _ 2 a a DET DT Definite=Ind|PronType=Art 6 det _ _ 3 second second ADJ JJ Degree=Pos|NumForm=Word|NumType=Ord 6 amod _ _ 4 half half NOUN NN Number=Sing|NumForm=Word|NumType=Frac 6 compound _ SpaceAfter=No 5 - - PUNCT HYPH _ 4 punct _ SpaceAfter=No 6 life life NOUN NN Number=Sing 11 nsubj:pass _ SpaceAfter=No 7 , , PUNCT , _ 9 punct _ _ 8 how how ADV WRB PronType=Int 9 advmod _ _ 9 much much ADJ JJ Degree=Pos 6 amod _ _ 10 is be AUX VBZ Mood=Ind|Number=Sing|Person=3|Tense=Pres|VerbForm=Fin 11 aux:pass _ _ 11 left leave VERB VBN Tense=Past|VerbForm=Part|Voice=Pass 0 root _ SpaceAfter=No 12 ? ? PUNCT . _ 11 punct _ _ ``` | # | verb | tense, mood | who | what, whom | to whom | where | when | other | roles by | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | **leave** | present · passive | | a second half life | | | | | vn keep-15.2 «NP V NP»: subject=Theme | ## The options {#options} ### Option 1 · ← Mova's choice · ✓ the right answer {#o1} A quarter ```conllu # sent_id = question:geography:58-deep-time-and-the-story-of-life:t3:o1:1 # text = A quarter 1 A a DET DT Definite=Ind|PronType=Art 2 det _ _ 2 quarter quarter NOUN NN Number=Sing 0 root _ _ ``` The frames reader finds no event or fact in this sentence. ### Option 2 {#o2} Half, still ```conllu # sent_id = question:geography:58-deep-time-and-the-story-of-life:t3:o2:1 # text = Half, still 1 Half half NOUN NN Number=Sing|NumForm=Word|NumType=Frac 0 root _ SpaceAfter=No 2 , , PUNCT , _ 1 punct _ _ 3 still still ADV RB _ 1 advmod _ _ ``` The frames reader finds no event or fact in this sentence. ### Option 3 {#o3} Nothing at all ```conllu # sent_id = question:geography:58-deep-time-and-the-story-of-life:t3:o3:1 # text = Nothing at all 1 Nothing nothing PRON NN Number=Sing|PronType=Neg 0 root _ _ 2 at at ADP IN _ 3 case _ _ 3 all all DET DT PronType=Tot 1 nmod _ _ ``` The frames reader finds no event or fact in this sentence. ### Option 4 {#o4} Three quarters ```conllu # sent_id = question:geography:58-deep-time-and-the-story-of-life:t3:o4:1 # text = Three quarters 1 Three three NUM CD NumForm=Word|NumType=Card 2 nummod _ _ 2 quarters quarter NOUN NNS Number=Plur 0 root _ _ ``` The frames reader finds no event or fact in this sentence. **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. 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