climate change and glaciers

average temperatures are around ______ degrees Celsius, and they only get an average _____ of snow a year

-50, 3mm

the largest glaciers today are small compared with the glaciers in the last major ice age. beginning about ____________, sheets of ice spread over most of North America and Eurasia.

2 million years ago

at the thickest point, greenlands glaciers goes down to ______ m from top to bottom.

2700

_________ has the harshest conditions on earth.

Antarctica

the entire continent of _____ is covered by a glacier. most of the island of Greenland, an of __________ square kilometres is also covered by a glacier.

Antarctica, 1.8 million

the polar ice cap is a large sheet of ice covering the _________ ocean. it produces similar weather effects.

Arctic

glaciers store _________ amounts of fresh water as ______ and _______. some of this water, especially at the melting _______ of a glacier, rejoins the water cycle, adding water vapour into the atmosphere (one of the ______________ gasses )

HUGE, snow, ice, edges, greenhouse

______ ______ flows off glaciers, cooling the surrounding area and helping form strong polar winds. because they are so cold, there is _______ _________.

cold, air, little, precipitation

-__________ (no.1

corals

_________ deep in ocean and lake sediments

fossils

gas trapped in ice core samples (___________)

glaciers

hard rock such as _______, is difficult for a glacier to break down (________) than a softer rock such as sandstone.

granite, erode

glaciers are large masses of _______and _____built up over thousands of years

ice, snow

as glaciers have formed over ______ of years, we can collect data from the ice that helps us understand the ________ changes, which lead to overall ________ changes

millions, weather, climate

glaciers move slowly but can change the shape of _________, valleys, and ________ - these features are ________ of past glaciation.

mountains, islands, evidence

they occur in the high altitudes of _____ and near earths _____

mountains, poles

because glaciers _____, we can get data from different areas of the earth. we can even make __________ where the ice from the ice burgs came from!

move, predictions

a glacier tends to ______ the hard rocks, leaving grooves called _________ etched in the bedrock by boulders and gravel being dragged around the bottom. these tell us the _______ that a glacier has moved.

polish, STRIATIONS, directions

glaciers move _____ . these rocks can hold _______ to the past as well...... we call these _______

rock, answers, FOSSILS

_____________ data

satellite

when the ice began to melt at the end of the last ice age, ____________ rose. _____ that had been pressed down by the immense weight of the ice continued to move upwards as well, adding more area for _____ and animals to live. but people are concerned about ________ _________ and fear that the coastal lands will be covered with water if the polar ice melts too quickly.

sea level, land, humans, global warming

-_________ rings

tree

the gasses trapped in the different layers built up over time can be compared to other data collected and _____ can be seen.

trends

the lower layers of glaciers are turned into clear ice because of the ______ of the snow above

weight