A.A large mass of ice that moves slowly. -
B.A hill that has steep sides and a flat top. -
C.A large flat area of land that is high above sea level. -
D.patterns of colors in the sky that can be seen at night in extreme northern parts of the world. -
E.The rise and fall of the sea that happens twice every day. -
F.The wide part of a river at the place where it joins the sea. -
G.A field with grass and often wild flowers in it. -
H.An area of grass, especially near to a house or in a park, that is cut regularly to keep it short. -
I.A high area of rock with a very steep side, often on a coast. -
J.An area of coral, the top of which can sometimes be seen just above the sea. -
K.A narrow area of water that flows into the land from the sea, a lake, etc. -
L.A small stream. -
M.An area of sea water separated from the sea by a reef. -
N.Water that flows naturally along a fixed route formed by a channel cut into rock or ground, usually at ground level. -
O.A plant whose large, flat leaves and cup-shaped petals float on the surface of lakes and pools. -
P.One of the parts of a tree that grows out from the main trunk and has leaves, flowers, or fruit on it. -
Q.A wall built across a river that stops the river's flow and collects the water, especially to make a reservoir. -
R.The part of a plant that grows down into the earth to get water and food and holds the plant firm in the ground. -
S.Any of several types of evergreen trees that have very thin leaves and are grown. For their wood or for use as Christmas trees. -
T.An area of very wet, soft land. -
U.The land along the edge of the sea. -
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