The Earth is made up of 1._..Jayers. The outer layer is called the 2.__ and is divided into the 3.__
and 4.__
The
top layer floats on the 5.__
which is semi-molten. Molten rock is
called 6. ___7.___
are formed in this layer by very high
temperatures. The 8.___
is the third layer and extends from 2900
km to 6370 km down.

This is all you, but i can give you some topics that you could try. if it rained when you want to do something outdoors, it 'limits' that human activity. maybe you want to do an experiment that goes throughout the whole year and you have to have above freezing the entire year. this 'limits' your activity. i thought of those just off of the top of my head. something that gets to me that might be getting to you is you are thinking too hard about what to do. think simply, and if it is too simple, then bump it up just a little bit.

Ibelieve the answer is c. map projections.hope my answer has you : )

The us is first  the  u.s. economy  remains the  largest in the world  in terms of nominal  gdp. however, the  u.s. economy  loses its spot as the number one  economy  to china when  measured  in terms of  gdp  based on ppp. in these terms, china's  gdp  is $23.19 trillion exceeds the  u.s. gdp  of $19.42 trillion

A) it is created from magma