ACROSS
1: Cape Farewell expedition ship (12)
 

DOWN
1 and 15: Ocean separating Europe and North America (5, 8)
 

DOWN
2: Study of the oceans (12)
 

DOWN
3: Direction clockwise from north (4)
 

DOWN
14 and 4 down: Height of water in the ocean (3,5)
 

DOWN
5: The way plants make food (14)
 

ACROSS
6: Coral ---- (4)
   

ACROSS
7: Rescue (4)
   

ACROSS
11 and 8: Changes in Pacific Ocean that affect the weather (2, 4)
   

DOWN AND ACROSS
9 down and 23 across: Temperatures in Britain were much colder during the last --- --- (3,3)
   

DOWN
10: Abbreviation for steamship (2)
 

ACROSS
11 and 8: Changes in Pacific Ocean that affect the weather (2, 4)
   

ACROSS
12: African river that flows into the Atlantic (5)
   

ACROSS
13. Edge of the land (5)
   

ACROSS
14. Abbreviation for South East (2)
 

DOWN
14 and 4 down. Height of water in the ocean (3, 5)
 

DOWN
1 and 15: Ocean separating Europe and North America (5, 8)
 

ACROSS
16: Heavy fraction of oil, also colloquial name for sailor (3)
   

DOWN
17: Floats in the water (4)
 

ACROSS
18: Tiny plants and animals that live floating in the ocean (8)
   

DOWN
19: Abbreviation for North East (2)
 

DOWN
20: Relating to tides (5)
 

ACROSS
21: Packet of light energy (6)
   

DOWN
22: Arab boat (4)
 

DOWN AND ACROSS
9 down and 23 across: Temperatures in Britain were much colder during the last --- --- (3,3)
   

ACROSS
24: Scottish river that flows through Perth to the North Sea (3)
   

ACROSS
25: End of river nearest sea (5)
 

DOWN
25: Tea or coffee --- (3)
 

ACROSS
26: Visible radiation (5)
   

ACROSS
27: across travels as ----- (5)