Question

define :
1) mean sea level
2) magma ​

Answer 1

Answer:

MEAN SEA LEVEL :

Mean Sea Level (MSL) is the datum for measurement of elevation and altitude. Mean Sea Level is the equi potential surface of the Earth as described by the WGS84 geoid.

MAGMA :

Magma is extremely hot liquid and semi-liquid rock located under Earth's surface. ... This magma can push through holes or cracks in the crust, causing a volcanic eruption. When magma flows or erupts onto Earth's surface, it is called lava. Like solid rock, magma is a mixture of minerals.

Explanation:

Answer 2

Answer:

$mean \: sea \: level$

Mean Sea Level (MSL) is the datum for measurement of elevation and altitude. Mean Sea Level is the equipotential surface of the Earth as described by the WGS84 geoid.

$magma$

hot fluid or semi-fluid material below or within the earth's crust from which lava and other igneous rock is formed on cooling.