Which are examples of convection currents? check all that apply. marshmallows toasting over a campfire a pot being heated by an electric burner rice moving in a pot of water that is being heated a radiator that emits warm air and draws in cool air a hot air balloon rising and falling in the atmosphere

The answers that apply are;

Convection currents involve the transfer of heat in fluids (such as air and liquids). Since they are not good conductors of heat, when they are heated the layers being heated (especially from below) becomes hot and less dense, These layers begin to rise while the cooler layers above begin to sink and replace the rising hot less dense layers. This cycle continues in a loop to form conventional currents.

hello!

let's go through all of these words' definitions.

u-shaped valley - where the valley curves down like a u shape

corrie - similar to the hole created at the top of a volcano when it erupts, it's almost like a dent in a mountain

pyramidal peak - a mountain where the peak is very sharp, such as the matterhorn.

arete - two valleys separated by a thin mountain range

i'm going to assume you know how to read a topographic map, but in case you don't, feel free to comment.

now, let's figure out which one's which:

a - seems to be a mountain range separating two valleys, with a mountain running from top center to bottom center and two valleys on either side. therefore, i'd consider this an arete.

b - it looks like a dent into the mountain, like what a corrie is.

c - looks to be a valley, with two steeper sides curving up around the bottom of the valley which has a river in it. i would consider this an u-shaped valley.

hope this !

the value of the 4 in the hundreds place is 400 while the value of th e 4 in the tens place is 40

400 is way bigger than 40.