Strawberry fields forever

Starostin reconstructs a Paleo-Eurasian root *NEk’rV 'thorny bush' > Altaic *ńíkrV 'a k. of thorny tree', from which I derive Paleo-European *ag´ºr- (Gaulish agraniō- 'sloe, fruit of the blackthorn', English acorn¹, Latin agresta 'green grape', Greek ágrios 'wild'), with loss of the initial nasal. Its IE native counterpart would be *d^hreg´^h- 'sloetree, blackthorn'² (Celtic *dragenā 'sloe, fruit of the blackthorn'³, Albanian drédhë 'strawberry'). Greek hrá:ks, hró:ks 'grape' < *srāg-, is probably a Thracian loanword from the same root.

Paleo-Eurasian *bVrdzV 'thorn' is the origin of Kartvelian *bardzg-/*burdzg(a) 'thorn, thorny plant'. The sibilant *dz is reflexed as *g´ in IE *b^hrag´- 'strawberry' > Lithuanian brãškē 'garden strawberry', Latin frāgum 'strawberry'⁴ and as *g´^h in *wreH2g´^h- 'thorn' > Celtic *wragi- 'needle', Lithuanian rãžas 'dry stalk, stubble; pronk of fork', Greek hrákhos 'thorn-hedge', hrákhis 'spine, backbone'.

Altaic *núŕi (˜ -e) 'a k. of berry, grape'⁵ is related to Hittite muri- '(bunch) of grapes' and IE *moro- 'blackberry'.
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¹ Indo-Europeanists usually group this with Lithuanian uga 'berry', Old Church Slavic jagoda 'fruit', vin-jaga 'grape', but I prefer to group the Balto-Slavic forms with Latin ūva 'grape', thus reconstructing *H3g^wh-ā 'berry'.
² Found (with simplification of the initial cluster) in Basque lahar, nahar 'blackberry (Rubus fructicosus); buckthorn (Rhamnus cathartica); caltrop (Tribulus terrestris)'.
³ Related to this is *d^hren- 'cornel cherry' (Old High German dirn-baum, Russian derën) ~ *tºrnu- 'thorn'.
⁴ Usually though to be derivated from *srāg-. French fraise, Spanish fresa 'strawberry' is probably an Italoid loanword from the same root (Italoid is a "satem" language with *b^h- > f- like Latin). Basque has araga 'strawberry' and arakatz 'gooseberry'.
⁵ Notice than the supposed Korean cognate *nùrúk 'yeast' presented in the database doesn't correspond to this root but to *ńjuŕge 'a k. of weed' < Paleo-Eurasian *nUŕV 'grain, corn'.

Words for 'sea'

There's no universal word for 'sea' in IE languages. The most widespread (Celtic, Latin, Germanic, Balto-Slavic) one is *mori-, related to Altaic *mju:ri 'water'.

Another widespread root is *seH2l- 'salt, sea'¹ > Greek halê 'sea'², which I think ultimately comes from PNC *q’eɦlV (˜ -ɫ-) 'bitter'³, with an evolution PNC *q’- > pre-PIE *χ- > PIE *s- (by Fournet's Law). This Vasco-Caucasian root is reflected in Basque gatz 'salt', gazi 'salty' + PNC *ts’s’wenhV 'salt'⁴ > *gas-dane > gazta(i), gazna 'cheese', both Cantabrian loanwords.

Dolgopolsky proposes a Paleo-Eurasian root *dalqV 'wave' (ND 526) reflected in IE *d^helH- > Greek thálassa (Attic thálatta) 'sea'. In a IE substrate language (probably Italoid), this root gives Greek sálos 'turbulent movement of the sea, flushing of the waves', Latin salum 'open sea; sea waves'⁵.

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¹ Without any linguistic evidence, Arnaud Fournet relates this to Kartvelian *zoɣw-. See his document.
² A feminine word whose masculine counterpart is halós 'salt'.

³ The glottalized stop is retained (with secondary labialization) in Kartvelian *q’wel- 'cheese'.
⁴ Native outputs from this root are itsaso 'sea', itze 'sea' (an archaic form quoted by Trombetti) + urde 'pig' > izurde, gizaurde 'dolphin' (lit. 'sea-pig').
⁵ Which again Fournet unjustifiedly relates to IE *seH2l-.

Two roots for 'earth'

According to Bengtson, Basque lur, lu- 'earth' is related to PNC *lhemdɮɮwɨ 'earth'¹.  This rooy is also found as a loanword in substratal IE *lendh- 'open land, waste' (Celtic, Germanic, Balto-Slavic) and Uralic *lamti (*lamtз) 'lowland, meadow'. I supose this term was introduced by Neolithic farmers of the Linear Ceramics (LBK) culture. From Gaulish *landā 'open land' come the toponym Landes and Basque landa 'field, lot'2.

There's also a widespread Paleo-Eurasian root *dVQV 'dirt, clay' whose Basque reflexes are lohi, lot- 'dirty, mud' and zohi, zot- 'clod of earth; brick', the first with the standard treatment of the initial dental stop and the second with assibilation. 

This root was borrowed into PIE *dhigh- 'wall, fortification' (Sanskrit sa-dih- 'mound, heap, wall', Avestan para-daēza 'enclosure'³, Greek teîkhos ~ toîkhos 'wall'), which in NW languages refers to clay-like substances (e.g. English dough). But the native PIE reflex is *dheghóm 'earth'.

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¹ Dialectally also 'uncultivated land, desert'. 

² There is also the old collective Biscayan form landar 'desert'.
³ Borrowed into Greek parédeisos, hence English paradise.